Southwestern entrance mosaic
The southwestern entrance mosaic, situated in the tympanum of the southwestern entrance, dates from the reign of Basil II.[260] It was rediscovered during the restorations of 1849 by the Fossatis. The Virgin sits on a throne without a back, her feet resting on a pedestal, embellished with precious stones. The Christ Child sits on her lap, giving his blessing and holding a scroll in his left hand. On her left side stands emperor Constantine in ceremonial attire, presenting a model of the city to Mary. The inscription next to him says: "Great emperor Constantine of the Saints". On her right side stands emperor Justinian I, offering a model of the Hagia Sophia. The medallions on both sides of the Virgin's head carry the nomina sacra MP and ΘΥ, abbreviations of the Greek: Μήτηρ του Θεοῦ, romanized: Mētēr Theou, lit. 'Mother of God'.[261] The composition of the figure of the Virgin enthroned was probably copied from the mosaic inside the semi-dome of the apse inside the liturgical space.[262]
The mosaic in the semi-dome above the apse at the east end shows Mary, mother of Jesus holding the Christ Child and seated on a jewelled thokos backless throne.[262] Since its rediscovery after a period of concealment in the Ottoman era, it "has become one of the foremost monuments of Byzantium".[262] The infant Jesus's garment is depicted with golden tesserae.
Guillaume-Joseph Grelot, who had travelled to Constantinople, in 1672 engraved and in 1680 published in Paris an image of the interior of Hagia Sophia which shows the apse mosaic indistinctly.[262] Together with a picture by Cornelius Loos drawn in 1710, these images are early attestations of the mosiac before it was covered towards the end of the 18th century.[262] The mosaic of the Virgin and Child was rediscovered during the restorations of the Fossati brothers in 1847–1848 and revealed by the restoration of Thomas Whittemore in 1935–1939.[262] It was studied again in 1964 with the aid of scaffolding.[262][263]
It is not known when this mosaic was installed.[262] According to Cyril Mango, the mosaic is "a curious reflection on how little we know about Byzantine art".[264] The work is generally believed to date from after the end of Byzantine Iconoclasm and usually dated to the patriarchate of Photius I (r. 858–867, 877–886) and the time of the emperors Michael III (r. 842–867) and Basil I (r. 867–886).[262] Most specifically, the mosaic has been connected with a surviving homily known to have been written and delivered by Photius in the cathedral on 29 March 867.[262][265][266][267][268]
Other scholars have favoured earlier or later dates for the present mosaic or its composition. Nikolaos Oikonomides pointed out that Photius's homily refers to a standing portrait of the Theotokos – a Hodegetria – while the present mosaic shows her seated.[269] Likewise, a biography of the patriarch Isidore I (r. 1347–1350) by his successor Philotheus I (r. 1353–1354, 1364–1376) composed before 1363 describes Isidore seeing a standing image of the Virgin at Epiphany in 1347.[262] Serious damage was done to the building by earthquakes in the 14th century, and it is possible that a standing image of the Virgin that existed in Photius's time was lost in the earthquake of 1346, in which the eastern end of Hagia Sophia was partly destroyed.[270][262] This interpretation supposes that the present mosaic of the Virgin and Child enthroned is of the late 14th century, a time in which, beginning with Nilus of Constantinople (r. 1380–1388), the patriarchs of Constantinople began to have official seals depicting the Theotokos enthroned on a thokos.[271][262]
Still other scholars have proposed an earlier date than the later 9th century. According to George Galavaris, the mosaic seen by Photius was a Hodegetria portrait which after the earthquake of 989 was replaced by the present image not later than the early 11th century.[271][270] According to Oikonomides however, the image in fact dates to before the Triumph of Orthodoxy, having been completed c. 787–797, during the iconodule interlude between the First Iconoclast (726–787) and the Second Iconoclast (814–842) periods.[269] Having been plastered over in the Second Iconoclasm, Oikonomides argues a new, standing image of the Virgin Hodegetria was created above the older mosaic in 867, which then fell off in the earthquakes of the 1340s and revealed again the late 8th-century image of the Virgin enthroned.[269]
More recently, analysis of a hexaptych menologion icon panel from Saint Catherine's Monastery at Mount Sinai has determined that the panel, showing numerous scenes from the life of the Virgin and other theologically significant iconic representations, contains an image at the centre very similar to that in Hagia Sophia.[262] The image is labelled in Greek merely as: Μήτηρ Θεοῦ, romanized: Mētēr Theou, lit. 'Mother of God', but in the Georgian language the inscription reveals the image is labelled "of the semi-dome of Hagia Sophia".[262] This image is therefore the oldest depiction of the apse mosaic known and demonstrates that the apse mosaic's appearance was similar to the present day mosaic in the late 11th or early 12th centuries, when the hexaptych was inscribed in Georgian by a Georgian monk, which rules out a 14th-century date for the mosaic.[262]
The portraits of the archangels Gabriel and Michael (largely destroyed) in the bema of the arch also date from the 9th century. The mosaics are set against the original golden background of the 6th century. These mosaics were believed to be a reconstruction of the mosaics of the 6th century that were previously destroyed during the iconoclastic era by the Byzantines of that time, as represented in the inaugural sermon by the patriarch Photios. However, no record of figurative decoration of Hagia Sophia exists before this time.[272]
The Viking Inscription
In the southern section of Hagia Sophia, a 9th-century Viking inscription has been discovered, which reads, "Halvdan was here." It is theorized that the inscription was created by a Viking soldier serving as a mercenary in the Eastern Roman Empire.[249]
The first mosaics which adorned the church were completed during the reign of Justin II.[250] Many of the non-figurative mosaics in the church come from this period. Most of the mosaics, however, were created in the 10th and 12th centuries,[251][better source needed] following the periods of Byzantine Iconoclasm.
During the Sack of Constantinople in 1204, the Latin Crusaders vandalized valuable items in every important Byzantine structure of the city, including the golden mosaics of the Hagia Sophia. Many of these items were shipped to Venice, whose Doge Enrico Dandolo had organized the invasion and sack of Constantinople after an agreement with Prince Alexios Angelos, the son of a deposed Byzantine emperor.
Northern tympanum mosaics
The northern tympanum mosaics feature various saints. They have been able to survive due to their high and inaccessible location. They depict Patriarchs of Constantinople John Chrysostom and Ignatios of Constantinople standing, clothed in white robes with crosses, and holding richly jewelled Bibles. The figures of each patriarch, revered as saints, are identifiable by labels in Greek. The other mosaics in the other tympana have not survived probably due to the frequent earthquakes, as opposed to any deliberate destruction by the Ottoman conquerors.[279]
The dome was decorated with four non-identical figures of the six-winged angels which protect the Throne of God; it is uncertain whether they are seraphim or cherubim. The mosaics survive in the eastern part of the dome, but since the ones on the western side were damaged during the Byzantine period, they have been renewed as frescoes. During the Ottoman period each seraph's (or cherub's) face was covered with metallic lids in the shape of stars, but these were removed to reveal the faces during renovations in 2009.[280]
Works influenced by the Hagia Sophia
Many buildings have been modeled on the Hagia Sophia's core structure of a large central dome resting on pendentives and buttressed by two semi-domes.
Byzantine churches influenced by the Hagia Sophia include the Hagia Sophia in Thessaloniki, and the Hagia Irene. The latter was remodeled to have a dome similar to the Hagia Sophia's during the reign of Justinian.
Several mosques commissioned by the Ottoman dynasty have plans based on the Hagia Sophia, including the Süleymaniye Mosque and the Bayezid II Mosque.[281][282] Ottoman architects preferred to surround the central dome with four semi-domes rather than two.[283] There are four semi-domes on the Sultan Ahmed Mosque, the Fatih Mosque,[284] and the New Mosque (Istanbul). As with the original plan of the Hagia Sophia, these mosques are entered through colonnaded courtyards. However, the courtyard of the Hagia Sophia no longer exists.
Neo-Byzantine churches modeled on the Hagia Sophia include the Kronstadt Naval Cathedral, Holy Trinity Cathedral, Sibiu[285] and Poti Cathedral. Each closely replicates the internal geometry of the Hagia Sophia. The layout of the Kronstadt Naval Cathedral is nearly identical to the Hagia Sophia in size and geometry. Its marble revetment also mimics the style of the Hagia Sophia.
As with Ottoman mosques, several churches based on the Hagia Sophia include four semi-domes rather than two, such as the Church of Saint Sava in Belgrade.[286][287] The Catedral Metropolitana Ortodoxa in São Paulo and the Église du Saint-Esprit (Paris) both replace the two large tympanums beneath the main dome with two shallow semi-domes. The Église du Saint-Esprit is two thirds the size of the Hagia Sophia.
Several churches combine elements of the Hagia Sophia with a Latin cross plan. For instance, the transept of the Cathedral Basilica of Saint Louis (St. Louis) is formed by two semi-domes surrounding the main dome. The church's column capitals and mosaics also emulate the style of the Hagia Sophia. Other examples include the Alexander Nevsky Cathedral, Sofia, St Sophia's Cathedral, London, Saint Clement Catholic Church, Chicago, and the Basilica of the National Shrine of the Immaculate Conception.
Synagogues based on the Hagia Sophia include the Congregation Emanu-El (San Francisco),[288] Great Synagogue of Florence, and Hurva Synagogue.
Detail of the columns
Detail of the columns
Six patriarchs mosaic in the southern tympanum as drawn by the Fossati brothers
Moasics as drawn by the Fossati brothers
's engraving 1672, looking east and showing the apse mosaic
's engraving 1672, looking west
Watercolour of the interior by
Imperial Gate from the nave
19th-century cenotaph of
, and commander of the 1204
Fountain of Ahmed III from the gate of the külliye, by John Frederick Lewis, 1838
Southern side of Hagia Sophia, looking east, by John Frederick Lewis, 1838
Interior of Haghia Sophia
Hagia Sophia from the south-west, 1914
Hagia Sophia in the snow, December 2015
See also the thematically organised full bibliography in Stroth 2021.[1]
Links to related articles
Hagia Sophia kembali jadi masjid setelah sempat berstatus museum dan ditetapkan UNESCO sebagai warisan dunia. Melalui akun Twitternya, Presiden Turki Recep Tayyip Erdogan menganggapnya sebagai kebangkitan bangunan bersejarah tersebut.
"Kebangkitan Hagia Sophia...," tulis Erdogan di akun @RTErdogan yang dilihat detikcom pada Sabtu (11/7/2020). Tweet ini mendapat 23 ribu retweet dan komentar serta 76 ribu like dari para netizen.
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Kembalinya Hagia Sophia menjadi masjid sesuai Majelis Negara Turki membatalkan keputusan kabinet pada 1934. Keputusan ini mengundang reaksi dari masyarakat internasional, dengan sebagian mendukung dan menolak keputusan tersebut.
Terlepas dari reaksi netizen, warga internasional, dan sikap tiap negara, Hagia Sophia memang punya sejarah yang sangat panjang. Dikutip dari History, Hagia Sophia jadi saksi kejatuhan dan kebangkitan dinasti penguasa Turki.
Hagia Sophia dalam bahasa Turki disebut Ayasofya sedangkan dalam bahasa latin adalah Sancta Sophia. Nama Hagia Sophia artinya adalah kebijaksanaan sesuai peruntukan bangunan tersebut sebagai rumah ibadah.
360 Masehi: Kaisar Bizantium, Constantius I, memerintahkan pembangunan Hagia Sophia sebagai sebuah gereja untuk umat Kristen Ortodoks Yunani di Konstantinopel yang kini bernama Istanbul. Awalnya gereja ini beratapkan kayu.
404 : Bangunan Hagia Sophia pertama terbakar akibat kerusuhan yang terjadi di sekitar bangunan tersebut. Kerusuhan diakibatkan konflik politik antar keluarga Kaisar Arkadios yang kemudian menjadi penguasa pada 395-408 AD.
415: Struktur kedua Hagia Sophia selesai dibangun Kaisar Theodosis II yang merupakan penerus Arkadio. Bangunan yang baru memiliki lima nave (tempat bangku-bangku umat) dan jalan masuk yang khas dengan atap terbuat dari kayu.
532: Dikutip dari Encyclopedia Britannica, Hagia Sophia terbakar kedua kalinya dalam peristiwa Revolusi Nika atau Nika Revolt. Revolusi tersebut melawan Kaisar Justinian I yang memerintah pada 527-565. Saat itu Hagia Sophia masih menjadi bangunan penting penganut Ortodoks Yunani.
532: Masih di tahun yang sama, Kaisar Justinian memerintahkan penghancuran Hagia Sophia karena kondisinya yang rusak parah. Dia memerintahkan pembangunan kembali gereja tersebut dengan menunjuk arsitek Isidoros (Milet) dan Anthemios (Tralles).
537: Pembangunan ketiga Hagia Sophia selesai dalam lima tahun dan ibadah pertama dilakukan pada 27 Desember 537. Saat itu Kaisar Justinian disebut mengatakan, "Tuhanku, terima kasih atas kesempatan membangun sebuah tempat ibadah."
Hagia Sophia melanjutkan perannya yang sangat penting dalam politik dan sejarah Bizantium, termasuk menjadi saksi Perang Salib. Wilayah Konstantinopel termasuk Hagia Sophia sempat berada di bawah kekuasaan Romawi untuk waktu singkat. Kekaisaran Bizantium dikisahkan berhasil menguasai kembali kota tersebut dan Hagia Sophia yang kembali rusak.
Perubahan besar Hagia Sophia selanjutnya terjadi sekitar 200 tahun kemudian saat Dinasti Ottoman menguasai Kontantinopel. Di bawah pimpinan Sultan Muhammad Al Fatih (Mehmed II), dinasti ini berhasil menaklukkan wilayah tersebut dan mengganti namanya menjadi Istanbul pada 1453.
Dengan pengaruh Islam, Hagia Sophia diubah menjadi masjid dengan menutup ornamen bangunan yang bertema Orthodox. Ornamen diganti kaligrafi yang didesain Kazasker Mustafa İzzet. Kaligrafi tersebut antara lain tulisan Allah SWT, Nabi Muhammad SAW, empat khalifah pertama, dan dua cucu Rasulullah SAW.
th-century restoration
Many mosaics were uncovered in the 1930s by a team from the Byzantine Institute of America led by Thomas Whittemore. The team chose to let a number of simple cross images remain covered by plaster but uncovered all major mosaics found.
Because of its long history as both a church and a mosque, a particular challenge arises in the restoration process. Christian iconographic mosaics can be uncovered, but often at the expense of important and historic Islamic art. Restorers have attempted to maintain a balance between both Christian and Islamic cultures. In particular, much controversy rests upon whether the Islamic calligraphy on the dome of the cathedral should be removed, in order to permit the underlying Pantocrator mosaic of Christ as Master of the World to be exhibited (assuming the mosaic still exists).[255]
The Hagia Sophia has been a victim of natural disasters that have caused deterioration to the buildings structure and walls. The deterioration of the Hagia Sophia's walls can be directly attributed to salt crystallization. The crystallization of salt is due to an intrusion of rainwater that causes the Hagia Sophia's deteriorating inner and outer walls. Diverting excess rainwater is the main solution to the deteriorating walls at the Hagia Sophia.[256]
Built between 532 and 537, a subsurface structure under the Hagia Sophia has been under investigation, using LaCoste-Romberg gravimeters to determine the depth of the subsurface structure and to discover other hidden cavities beneath the Hagia Sophia. The hidden cavities have also acted as a support system against earthquakes. With these findings using the LaCoste-Romberg gravimeters, it was also discovered that the Hagia Sophia's foundation is built on a slope of natural rock.[257]
The Imperial Gate mosaic is located in the tympanum above that gate, which was used only by the emperors when entering the church. Based on style analysis, it has been dated to the late 9th or early 10th century. The emperor with a nimbus or halo could possibly represent emperor Leo VI the Wise or his son Constantine VII Porphyrogenitus bowing down before Christ Pantocrator, seated on a jewelled throne, giving his blessing and holding in his left hand an open book.[258] The text on the book reads: "Peace be with you" (John 20, John 20:19, 20:26) and "I am the light of the world" (John 8, John 8:12). On each side of Christ's shoulders is a circular medallion with busts: on his left the Archangel Gabriel, holding a staff, on his right his mother Mary.[259]
Sekilas tentang Sultan Mehmed II
Mehmed II, juga dikenal sebagai Sang Penakluk adalah salah satu sultan Kekaisaran Ottoman yang terkenal dengan kecerdasannya. Mehmed II memerintah Ottoman untuk waktu yang singkat, dari 1444 hingga 1446, setelah ayahnya. Setelah waktu itu Sultan Murad II melepaskan takhta tetapi ketika dia meninggal, Mehmed II memerintah Kekaisaran Ottoman dari tahun 1451 hingga 1481. Mehmet II adalah seorang negarawan jenius dan seorang pemimpin militer yang juga tertarik pada sastra, seni rupa, dan arsitektur monumental. Dia dididik oleh sarjana terkenal Aksemseddin dan menurut sejarawan Ottoman dia berbicara tujuh bahasa dengan lancar, menurut situs theottomans.org.
Potret Sultan Mehmed II oleh Gentile Bellini. Museum Victoria dan Albert, London.[wikimedia.org]
Mehmed II lahir sebagai putra Sultan Murad I dan Huma Hatun pada malam 29 Maret tetapi dicatat pada 30 Maret 1432, di Edirne. Masa kecilnya dihabiskan di Edirne. Dia termotivasi untuk merebut kota Konstantinopel berdasarkan kata-kata Nabi Muhammad untuk penakluk Konstantinopel: "Suatu hari, Konstantinopel akan ditaklukkan. Betapa indah dan diberkatinya komandan penaklukannya dan tentaranya!"
Sultan Mehmed II, menggulingkan Kekaisaran Byzantium dengan menaklukkan Konstantinopel sebagai konsolidasi Kekaisaran Ottoman dan menandai akhir Abad Pertengahan. Dia mengambil nama "penakluk" (fatih) setelah penaklukan Istanbul pada tanggal 29 Mei 1453. Penaklukan Istanbul berarti berakhirnya Kekaisaran Byzantium dan memasuki fase kebangkitan kota di bawah pemerintahan Mehmed dan para penerusnya.
Perebutan Istanbul diikuti oleh suksesi panjang kampanye yang menghasilkan perpanjangan besar kekuasaan langsung Ottoman. Setelah penaklukan kota, Mehmed sang Penakluk berbaris menuju Morea dan merebut kota-kota Yunani satu demi satu. Namun, dia diancam dari belakang oleh kerajaan Karaman dan karena itu beralih ke Anatolia untuk menaklukkan mereka dan untuk mencaplok wilayah mereka. Dia kemudian menaklukkan daerah yang dekat dengan Laut Hitam barat dan ditunjuk sebagai gubernur Kzl Ahmet yang merupakan pendiri kerajaan Isfen-diyar. Setelah itu, ia berperang melawan Uzun Hasan, penguasa Akkoyunlus dan mengalahkannya. Di antara daerah-daerah yang jatuh ke Mehmet II adalah Serbia, Yunani, Kekaisaran Trezibizond, Wallachia, Bosnia, Karaman, Albania dan beberapa perusahaan maritim Venesia dan Geneose.
Church of Theodosius II
A second church on the site was ordered by Theodosius II (r. 402–450), who inaugurated it on 10 October 415.[36] The Notitia Urbis Constantinopolitanae, a fifth-century list of monuments, names Hagia Sophia as Magna Ecclesia, 'Great Church', while the former cathedral Hagia Irene is referred to as Ecclesia Antiqua, 'Old Church'. At the time of Socrates of Constantinople around 440, "both churches [were] enclosed by a single wall and served by the same clergy".[25] Thus, the complex would have encompassed a large area including the future site of the Hospital of Samson.[35] If the fire of 404 destroyed only the 4th-century main basilica church, then the 5th century Theodosian basilica could have been built surrounded by a complex constructed primarily during the fourth century.[35]
During the reign of Theodosius II, the emperor's elder sister, the Augusta Pulcheria (r. 414–453) was challenged by the patriarch Nestorius (r. 10 April 428 – 22 June 431).[37][38] The patriarch denied the Augusta access to the sanctuary of the "Great Church", likely on 15 April 428.[38] According to the anonymous Letter to Cosmas, the virgin empress, a promoter of the cult of the Virgin Mary who habitually partook in the Eucharist at the sanctuary of Nestorius's predecessors, claimed right of entry because of her equivalent position to the Theotokos – the Virgin Mary – "having given birth to God".[39][38] Their theological differences were part of the controversy over the title theotokos that resulted in the Council of Ephesus and the stimulation of Monophysitism and Nestorianism, a doctrine, which like Nestorius, rejects the use of the title.[37] Pulcheria along with Pope Celestine I and Patriarch Cyril of Alexandria had Nestorius overthrown, condemned at the ecumenical council, and exiled.[39][37]
The area of the western entrance to the Justinianic Hagia Sophia revealed the western remains of its Theodosian predecessor, as well as some fragments of the Constantinian church.[35] German archaeologist Alfons Maria Schneider began conducting archaeological excavations during the mid-1930s, publishing his final report in 1941.[35] Excavations in the area that had once been the 6th-century atrium of the Justinianic church revealed the monumental western entrance and atrium, along with columns and sculptural fragments from both 4th- and 5th-century churches.[35] Further digging was abandoned for fear of harming the structural integrity of the Justinianic building, but parts of the excavation trenches remain uncovered, laying bare the foundations of the Theodosian building.
The basilica was built by architect Rufinus.[40][41] The church's main entrance, which may have had gilded doors, faced west, and there was an additional entrance to the east.[42] There was a central pulpit and likely an upper gallery, possibly employed as a matroneum (women's section).[42] The exterior was decorated with elaborate carvings of rich Theodosian-era designs, fragments of which have survived, while the floor just inside the portico was embellished with polychrome mosaics.[35] The surviving carved gable end from the centre of the western façade is decorated with a cross-roundel.[35] Fragments of a frieze of reliefs with 12 lambs representing the 12 apostles also remain; unlike Justinian's 6th-century church, the Theodosian Hagia Sophia had both colourful floor mosaics and external decorative sculpture.[35]
At the western end, surviving stone fragments of the structure show there was vaulting, at least at the western end.[35] The Theodosian building had a monumental propylaeum hall with a portico that may account for this vaulting, which was thought by the original excavators in the 1930s to be part of the western entrance of the church itself.[35] The propylaeum opened onto an atrium which lay in front of the basilica church itself. Preceding the propylaeum was a steep monumental staircase following the contours of the ground as it sloped away westwards in the direction of the Strategion, the Basilica, and the harbours of the Golden Horn.[35] This arrangement would have resembled the steps outside the atrium of the Constantinian Old St Peter's Basilica in Rome.[35] Near the staircase, there was a cistern, perhaps to supply a fountain in the atrium or for worshippers to wash with before entering.[35]
The 4th-century skeuophylakion was replaced in the 5th century by the present-day structure, a rotunda constructed of banded masonry in the lower two levels and of plain brick masonry in the third.[35] Originally this rotunda, probably employed as a treasury for liturgical objects, had a second-floor internal gallery accessed by an external spiral staircase and two levels of niches for storage.[35] A further row of windows with marble window frames on the third level remain bricked up.[35] The gallery was supported on monumental consoles with carved acanthus designs, similar to those used on the late 5th-century Column of Leo.[35] A large lintel of the skeuophylakion's western entrance – bricked up during the Ottoman era – was discovered inside the rotunda when it was archaeologically cleared to its foundations in 1979, during which time the brickwork was also repointed.[35] The skeuophylakion was again restored in 2014 by the Vakıflar.[35]
A fire started during the tumult of the Nika Revolt, which had begun nearby in the Hippodrome of Constantinople, and the second Hagia Sophia was burnt to the ground on 13–14 January 532. The court historian Procopius wrote:[43]
And by way of shewing that it was not against the Emperor alone that they [the rioters] had taken up arms, but no less against God himself, unholy wretches that they were, they had the hardihood to fire the Church of the Christians, which the people of Byzantium call "Sophia", an epithet which they have most appropriately invented for God, by which they call His temple; and God permitted them to accomplish this impiety, foreseeing into what an object of beauty this shrine was destined to be transformed. So the whole church at that time lay a charred mass of ruins.
— Procopius, De aedificiis, I.1.21–22
Emperor Alexander mosaic
The Emperor Alexander mosaic is not easy to find for the first-time visitor, located on the second floor in a dark corner of the ceiling. It depicts the emperor Alexander in full regalia, holding a scroll in his right hand and a globus cruciger in his left. A drawing by the Fossatis showed that the mosaic survived until 1849 and that Thomas Whittemore, founder of the Byzantine Institute of America who was granted permission to preserve the mosaics, assumed that it had been destroyed in the earthquake of 1894. Eight years after his death, the mosaic was discovered in 1958 largely through the researches of Robert Van Nice. Unlike most of the other mosaics in Hagia Sophia, which had been covered over by ordinary plaster, the Alexander mosaic was simply painted over and reflected the surrounding mosaic patterns and thus was well hidden. It was duly cleaned by the Byzantine Institute's successor to Whittemore, Paul A. Underwood.[273][274]
The Empress Zoe mosaic on the eastern wall of the southern gallery dates from the 11th century. Christ Pantocrator, clad in the dark blue robe (as is the custom in Byzantine art), is seated in the middle against a golden background, giving his blessing with the right hand and holding the Bible in his left hand. On either side of his head are the nomina sacra IC and XC, meaning Iēsous Christos. He is flanked by Constantine IX Monomachus and Empress Zoe, both in ceremonial costumes. He is offering a purse, as a symbol of donation, he made to the church, while she is holding a scroll, symbol of the donations she made. The inscription over the head of the emperor says: "Constantine, pious emperor in Christ the God, king of the Romans, Monomachus". The inscription over the head of the empress reads as follows: "Zoë, the very pious Augusta". The previous heads have been scraped off and replaced by the three present ones. Perhaps the earlier mosaic showed her first husband Romanus III Argyrus or her second husband Michael IV. Another theory is that this mosaic was made for an earlier emperor and empress, with their heads changed into the present ones.[275]
The Comnenus mosaic, also located on the eastern wall of the southern gallery, dates from 1122. The Virgin Mary is standing in the middle, depicted, as usual in Byzantine art, in a dark blue gown. She holds the Christ Child on her lap. He gives his blessing with his right hand while holding a scroll in his left hand. On her right side stands emperor John II Comnenus, represented in a garb embellished with precious stones. He holds a purse, symbol of an imperial donation to the church. His wife, the empress Irene of Hungary stands on the left side of the Virgin, wearing ceremonial garments and offering a document. Their eldest son Alexius Comnenus is represented on an adjacent pilaster. He is shown as a beardless youth, probably representing his appearance at his coronation aged seventeen. In this panel, one can already see a difference with the Empress Zoe mosaic that is one century older. There is a more realistic expression in the portraits instead of an idealized representation. The Empress Irene (born Piroska), daughter of Ladislaus I of Hungary, is shown with plaited blond hair, rosy cheeks, and grey eyes, revealing her Hungarian descent. The emperor is depicted in a dignified manner.[276]
The Deësis mosaic (Δέησις, "Entreaty") probably dates from 1261. It was commissioned to mark the end of 57 years of Latin Catholic use and the return to the Eastern Orthodox faith. It is the third panel situated in the imperial enclosure of the upper galleries. It is widely considered the finest in Hagia Sophia, because of the softness of the features, the humane expressions and the tones of the mosaic. The style is close to that of the Italian painters of the late 13th or early 14th century, such as Duccio. In this panel the Virgin Mary and John the Baptist (Ioannes Prodromos), both shown in three-quarters profile, are imploring the intercession of Christ Pantocrator for humanity on Judgment Day. The bottom part of this mosaic is badly deteriorated.[277] This mosaic is considered as the beginning of a renaissance in Byzantine pictorial art.[278]
Notable elements and decorations
Originally, under Justinian's reign, the interior decorations consisted of abstract designs on marble slabs on the walls and floors as well as mosaics on the curving vaults. Of these mosaics, the two archangels Gabriel and Michael are still visible in the spandrels (corners) of the bema. There were already a few figurative decorations, as attested by the late 6th-century ekphrasis of Paul the Silentiary, the Description of Hagia Sophia. The spandrels of the gallery are faced in inlaid thin slabs (opus sectile), showing patterns and figures of flowers and birds in precisely cut pieces of white marble set against a background of black marble. In later stages, figurative mosaics were added, which were destroyed during the iconoclastic controversy (726–843). Present mosaics are from the post-iconoclastic period.
Apart from the mosaics, many figurative decorations were added during the second half of the 9th century: an image of Christ in the central dome; Eastern Orthodox saints, prophets and Church Fathers in the tympana below; historical figures connected with this church, such as Patriarch Ignatius; and some scenes from the Gospels in the galleries. Basil II let artists paint a giant six-winged seraph on each of the four pendentives.[82] The Ottomans covered their faces with golden stars,[82] but in 2009, one of them was restored to its original state.[240]
Reversion to mosque (2018–present)
Since 2018, Turkish president Recep Tayyip Erdoğan had talked of reverting the status of the Hagia Sophia back to a mosque, a move seen to be very popularly accepted by the religious populace whom Erdoğan was attempting to persuade.[147] On 31 March 2018 Erdoğan recited the first verse of the Quran in the Hagia Sophia, dedicating the prayer to the "souls of all who left us this work as inheritance, especially Istanbul's conqueror," strengthening the political movement to make the Hagia Sophia a mosque once again, which would reverse Atatürk's measure of turning the Hagia Sophia into a secular museum.[148] In March 2019 Erdoğan said that he would change the status of Hagia Sophia from a museum to a mosque,[149] adding that it had been a "very big mistake" to turn it into a museum.[150] As a UNESCO World Heritage site, this change would require approval from UNESCO's World Heritage Committee.[151] In late 2019 Erdoğan's office took over the administration and upkeep of the nearby Topkapı Palace Museum, transferring responsibility for the site from the Ministry of Culture and Tourism by presidential decree.[152][153][154]
In 2020, Turkey's government celebrated the 567th anniversary of the Conquest of Constantinople with an Islamic prayer in Hagia Sophia. Erdoğan said during a televised broadcast "Al-Fath surah will be recited and prayers will be done at Hagia Sophia as part of conquest festival".[155] In May, during the anniversary events, passages from the Quran were read in the Hagia Sophia. Greece condemned this action, while Turkey in response accused Greece of making "futile and ineffective statements".[156] In June, the head of Turkey's Directorate of Religious Affairs (Diyanet) said that "we would be very happy to open Hagia Sophia for worship" and that if it happened "we will provide our religious services as we do in all our mosques".[142] On 25 June, John Haldon, president of the International Association of Byzantine Studies, wrote an open letter to Erdoğan asking that he "consider the value of keeping the Aya Sofya as a museum".[157]
On 10 July 2020, the decision of the Council of Ministers from 1935 to transform the Hagia Sophia into a museum was annulled by the Council of State, decreeing that Hagia Sophia cannot be used "for any other purpose" than being a mosque and that the Hagia Sophia was property of the Fatih Sultan Mehmet Han Foundation. The council reasoned Ottoman Sultan Mehmet II, who conquered Istanbul, deemed the property to be used by the public as a mosque without any fees and was not within the jurisdiction of the Parliament or a ministry council.[158][159] Despite secular and global criticism, Erdoğan signed a decree annulling the Hagia Sophia's museum status, reverting it to a mosque.[160][161] The call to prayer was broadcast from the minarets shortly after the announcement of the change and rebroadcast by major Turkish news networks.[161] The Hagia Sophia Museum's social media channels were taken down the same day, with Erdoğan announcing at a press conference that prayers themselves would be held there from 24 July.[161] A presidential spokesperson said it would become a working mosque, open to anyone similar to the Parisian churches Sacré-Cœur and Notre-Dame. The spokesperson also said that the change would not affect the status of the Hagia Sophia as a UNESCO World Heritage site, and that "Christian icons" within it would continue to be protected.[147] Earlier the same day, before the final decision, the Turkish Finance and Treasury Minister Berat Albayrak and the Justice Minister Abdulhamit Gül expressed their expectations of opening the Hagia Sophia to worship for Muslims.[162][163] Mustafa Şentop, Speaker of Turkey's Grand National Assembly, said "a longing in the heart of our nation has ended".[162] A presidential spokesperson claimed that all political parties in Turkey supported Erdoğan's decision;[164] however, the Peoples' Democratic Party had previously released a statement denouncing the decision, saying "decisions on human heritage cannot be made on the basis of political games played by the government".[165] The mayor of Istanbul, Ekrem İmamoğlu, said that he supports the conversion "as long as it benefits Turkey", adding that he felt that Hagia Sophia has been a mosque since 1453.[166] Ali Babacan attacked the policy of his former ally Erdoğan, saying the Hagia Sophia issue "has come to the agenda now only to cover up other problems".[167] Orhan Pamuk, Turkish novelist and Nobel laureate, publicly denounced the move, saying "Kemal Atatürk changed... Hagia Sophia from a mosque to a museum, honouring all previous Greek Orthodox and Latin Catholic history, making it as a sign of Turkish modern secularism".[161][168]
On 17 July, Erdoğan announced that the first prayers in the Hagia Sophia would be open to between 1,000 and 1,500 worshippers. He said that Turkey had sovereign power over Hagia Sophia and was not obligated to bend to international opinion.[169]
While the Hagia Sophia has now been rehallowed as a mosque, the place remains open for visitors outside of prayer times. While at the beginning the entrance was free,[170] later the Turkish government decided that, starting from 15 January 2024, foreign nationals would have to pay an entrance fee.[171]
On 22 July, a turquoise-coloured carpet was laid to prepare the mosque for worshippers; Ali Erbaş, head of the Diyanet, attended its laying.[167] The omphalion was left exposed. Due to the COVID-19 pandemic, Erbaş said Hagia Sophia would accommodate up to 1,000 worshippers at a time and asked that they bring "masks, a prayer rug, patience and understanding".[167] The mosque opened for Friday prayers on 24 July, the 97th anniversary of the signature of the Treaty of Lausanne, which established the borders of the modern Turkish Republic.[167] The mosaics of the Virgin and Child in the apse were covered by white drapes.[168] There had been proposals to conceal the mosaics with lasers during prayer times, but this idea was ultimately shelved.[172][173] Erbaş proclaimed during his sermon, "Sultan Mehmet the Conqueror dedicated this magnificent construction to believers to remain a mosque until the Day of Resurrection".[168] Erdoğan and some government ministers attended the midday prayers as many worshippers prayed outside; at one point the security cordon was breached and dozens of people broke through police lines.[168] Turkey invited foreign leaders and officials, including Pope Francis, for the prayers.[174] It is the fourth Byzantine church converted from museum to a mosque during Erdoğan's rule.[175]
In April 2022, the Hagia Sophia held its first Ramadan tarawih prayer in 88 years.[176]
Days before the final decision on the conversion was made, Ecumenical Patriarch Bartholomew I of Constantinople stated in a sermon that "the conversion of Hagia Sophia into a mosque would disappoint millions of Christians around the world", he also said that Hagia Sophia, which was "a vital center where East is embraced with the West", would "fracture these two worlds" in the event of conversion.[177][178] The proposed conversion was decried by other Orthodox Christian leaders, the Russian Orthodox Church's Patriarch Kirill of Moscow stating that "a threat to Hagia Sophia [wa]s a threat to all of Christian civilization".[179][180]
Following the Turkish government's decision, UNESCO announced it "deeply regret[ted]" the conversion "made without prior discussion", and asked Turkey to "open a dialogue without delay", stating that the lack of negotiation was "regrettable".[181][161] UNESCO further announced that the "state of conservation" of Hagia Sophia would be "examined" at the next session of the World Heritage Committee, urging Turkey "to initiate dialogue without delay, in order to prevent any detrimental effect on the universal value of this exceptional heritage".[181] Ernesto Ottone, UNESCO's Assistant Director-General for Culture said "It is important to avoid any implementing measure, without prior discussion with UNESCO, that would affect physical access to the site, the structure of the buildings, the site's moveable property, or the site's management".[181] UNESCO's statement of 10 July said "these concerns were shared with the Republic of Turkey in several letters, and again yesterday evening with the representative of the Turkish Delegation" without a response.[181]
The World Council of Churches, which claims to represent 500 million Christians of 350 denominations, condemned the decision to convert the building into a mosque, saying that would "inevitably create uncertainties, suspicions and mistrust"; the World Council of Churches urged Turkey's president Erdoğan "to reconsider and reverse" his decision "in the interests of promoting mutual understanding, respect, dialogue and cooperation, and avoiding cultivating old animosities and divisions".[182][183][184] At the recitation of the Sunday Angelus prayer at St Peter's Square on 12 July Pope Francis said, "My thoughts go to Istanbul. I think of Santa Sophia and I am very pained" (Italian: Penso a Santa Sofia, a Istanbul, e sono molto addolorato).[c][186][187] The International Association of Byzantine Studies announced that its 21st International Congress, due to be held in Istanbul in 2021, will no longer be held there and is postponed to 2022.[157]
Josep Borrell, the European Union's High Representative for Foreign Affairs and Vice-President of the European Commission, released a statement calling the decisions by the Council of State and Erdoğan "regrettable" and pointing out that "as a founding member of the Alliance of Civilisations, Turkey has committed to the promotion of inter-religious and inter-cultural dialogue and to fostering of tolerance and co-existence."[188] According to Borrell, the European Union member states' twenty-seven foreign ministers "condemned the Turkish decision to convert such an emblematic monument as the Hagia Sophia" at meeting on 13 July, saying it "will inevitably fuel the mistrust, promote renewed division between religious communities and undermine our efforts at dialog and cooperation" and that "there was a broad support to call on the Turkish authorities to urgently reconsider and reverse this decision".[189][190] Greece denounced the conversion and considered it a breach of the UNESCO World Heritage titling.[147] Greek culture minister Lina Mendoni called it an "open provocation to the civilised world" which "absolutely confirms that there is no independent justice" in Erdoğan's Turkey, and that his Turkish nationalism "takes his country back six centuries".[191] Greece and Cyprus called for EU sanctions on Turkey.[192] Morgan Ortagus, the spokesperson for the United States Department of State, noted: "We are disappointed by the decision by the government of Turkey to change the status of the Hagia Sophia."[191] Jean-Yves Le Drian, foreign minister of France, said his country "deplores" the move, saying "these decisions cast doubt on one of the most symbolic acts of modern and secular Turkey".[184] Vladimir Dzhabarov, deputy head of the foreign affairs committee of the Russian Federation Council, said that it "will not do anything for the Muslim world. It does not bring nations together, but on the contrary brings them into collision" and calling the move a "mistake".[191] The former deputy prime minister of Italy, Matteo Salvini, held a demonstration in protest outside the Turkish consulate in Milan, calling for all plans for accession of Turkey to the European Union to be terminated "once and for all".[193] In East Jerusalem, a protest was held outside the Turkish consulate on 13 July, with the burning of a Turkish flag and the display of the Greek flag and flag of the Greek Orthodox Church.[194] In a statement the Turkish foreign ministry condemned the burning of the flag, saying "nobody can disrespect or encroach our glorious flag".[195]
Ersin Tatar, prime minister of the Turkish Republic of Northern Cyprus, which is recognized only by Turkey, welcomed the decision, calling it "sound" and "pleasing".[196][191] He further criticized the government of Cyprus, claiming that "the Greek Cypriot administration, who burned down our mosques, should not have a say in this".[196] Through a spokesman the Foreign Ministry of Iran welcomed the change, saying the decision was an "issue that should be considered as part of Turkey's national sovereignty" and "Turkey's internal affair".[197] Sergei Vershinin, deputy foreign minister of Russia, said that the matter was of one of "internal affairs, in which, of course, neither we nor others should interfere."[198][199] The Arab Maghreb Union was supportive.[200] Ekrema Sabri, imam of the al-Aqsa Mosque, and Ahmed bin Hamad al-Khalili, grand mufti of Oman, both congratulated Turkey on the move.[200] The Muslim Brotherhood was also in favour of the news.[200] A spokesman for the Palestinian Islamist movement Hamas called the verdict "a proud moment for all Muslims".[201] Pakistani politician Chaudhry Pervaiz Elahi of the Pakistan Muslim League (Q) welcomed the ruling, claiming it was "not only in accordance with the wishes of the people of Turkey but the entire Muslim world".[202] The Muslim Judicial Council group in South Africa praised the move, calling it "a historic turning point".[203] In Nouakchott, capital of Mauritania, there were prayers and celebrations topped by the sacrifice of a camel.[204] On the other hand, Shawki Allam, grand mufti of Egypt, ruled that conversion of the Hagia Sophia to a mosque is "impermissible".[205]
When President Erdoğan announced that the first Muslim prayers would be held inside the building on 24 July, he added that "like all our mosques, the doors of Hagia Sophia will be wide open to locals and foreigners, Muslims and non-Muslims." Presidential spokesman İbrahim Kalın said that the icons and mosaics of the building would be preserved, and that "in regards to the arguments of secularism, religious tolerance and coexistence, there are more than four hundred churches and synagogues open in Turkey today."[206] Ömer Çelik, spokesman for the ruling Justice and Development Party (AKP), announced on 13 July that entry to Hagia Sophia would be free of charge and open to all visitors outside prayer times, during which Christian imagery in the building's mosaics would be covered by curtains or lasers.[193] The Turkish foreign minister, Mevlüt Çavuşoğlu, told TRT Haber on 13 July that the government was surprised at the reaction of UNESCO, saying that "We have to protect our ancestors' heritage. The function can be this way or that way – it does not matter".[207]
On 14 July the prime minister of Greece, Kyriakos Mitsotakis, said his government was "considering its response at all levels" to what he called Turkey's "unnecessary, petty initiative", and that "with this backward action, Turkey is opting to sever links with western world and its values".[208] In relation to both Hagia Sophia and the Cyprus–Turkey maritime zones dispute, Mitsotakis called for European sanctions against Turkey, referring to it as "a regional troublemaker, and which is evolving into a threat to the stability of the whole south-east Mediterranean region".[208] Dora Bakoyannis, Greek former foreign minister, said Turkey's actions had "crossed the Rubicon", distancing itself from the West.[209] On the day of the building's re-opening, Mitsotakis called the re-conversion evidence of Turkey's weakness rather than a show of power.[168]
Armenia's Foreign Ministry expressed "deep concern" about the move, adding that it brought to a close Hagia Sophia's symbolism of "cooperation and unity of humankind instead of clash of civilizations."[210] Catholicos Karekin II, the head of the Armenian Apostolic Church, said the move "violat[ed] the rights of national religious minorities in Turkey."[211] Sahak II Mashalian, the Armenian Patriarch of Constantinople, perceived as loyal to the Turkish government, endorsed the decision to convert the museum into a mosque. He said, "I believe that believers' praying suits better the spirit of the temple instead of curious tourists running around to take pictures."[212]
In July 2021, UNESCO asked for an updated report on the state of conservation and expressed "grave concern". There were also some concerns about the future of its World Heritage status.[213] Turkey responded that the changes had "no negative impact" on UNESCO standards and the criticism is "biased and political".[214]
Hagia Sophia is one of the greatest surviving examples of Byzantine architecture.[8] Its interior is decorated with mosaics, marble pillars, and coverings of great artistic value. Justinian had overseen the completion of the greatest cathedral ever built up to that time, and it was to remain the largest cathedral for 1,000 years until the completion of the cathedral in Seville in Spain.[215]
The Hagia Sophia uses masonry construction. The structure has brick and mortar joints that are 1.5 times the width of the bricks. The mortar joints are composed of a combination of sand and minute ceramic pieces distributed evenly throughout the mortar joints. This combination of sand and potsherds was often used in Roman concrete, a predecessor to modern concrete. A considerable amount of iron was used as well, in the form of cramps and ties.[216]
Justinian's basilica was at once the culminating architectural achievement of late antiquity and the first masterpiece of Byzantine architecture. Its influence, both architecturally and liturgically, was widespread and enduring in the Eastern Christianity, Western Christianity, and Islam alike.[217][218]
The vast interior has a complex structure. The nave is covered by a central dome which at its maximum is 55.6 m (182 ft 5 in) from floor level and rests on an arcade of 40 arched windows. Repairs to its structure have left the dome somewhat elliptical, with the diameter varying between 31.24 and 30.86 m (102 ft 6 in and 101 ft 3 in).[219]
At the western entrance and eastern liturgical side, there are arched openings extended by half domes of identical diameter to the central dome, carried on smaller semi-domed exedrae, a hierarchy of dome-headed elements built up to create a vast oblong interior crowned by the central dome, with a clear span of 76.2 m (250 ft).[8]
The theories of Hero of Alexandria, a Hellenistic mathematician of the 1st century AD, may have been utilized to address the challenges presented by building such an expansive dome over so large a space.[220] Svenshon and Stiffel proposed that the architects used Hero's proposed values for constructing vaults. The square measurements were calculated using the side-and-diagonal number progression, which results in squares defined by the numbers 12 and 17, wherein 12 defines the side of the square and 17 its diagonal, which have been used as standard values as early as in cuneiform Babylonian texts.[221]
Each of the four sides of the great square Hagia Sophia is approximately 31 m long,[222] and it was previously thought that this was the equivalent of 100 Byzantine feet.[221] Svenshon suggested that the size of the side of the central square of Hagia Sophia is not 100 Byzantine feet but instead 99 feet. This measurement is not only rational, but it is also embedded in the system of the side-and-diagonal number progression (70/99) and therefore a usable value by the applied mathematics of antiquity. It gives a diagonal of 140 which is manageable for constructing a huge dome like that of the Hagia Sophia.[223]
The stone floor of Hagia Sophia dates from the 6th century. After the first collapse of the vault, the broken dome was left in situ on the original Justinianic floor and a new floor was laid above the rubble when the dome was rebuilt in 558.[224] From the installation of this second Justinianic floor, the floor became part of the liturgy, with significant locations and spaces demarcated in various ways using different-coloured stones and marbles.[224]
The floor is predominantly made up of Proconnesian marble, quarried on Proconnesus (Marmara Island) in the Propontis (Sea of Marmara). This was the main white marble used in the monuments of Constantinople. Other parts of the floor, like the Thessalian verd antique "marble", were quarried in Thessaly in Roman Greece. The Thessalian verd antique bands across the nave floor were often likened to rivers.[225]
The floor was praised by numerous authors and repeatedly compared to a sea.[114] The Justinianic poet Paul the Silentiary likened the ambo and the solea connecting it to the sanctuary with an island in a sea, with the sanctuary itself a harbour.[114] The 9th-century Narratio writes of it as "like the sea or the flowing waters of a river".[114] Michael the Deacon in the 12th century also described the floor as a sea in which the ambo and other liturgical furniture stood as islands.[114] During the 15th-century conquest of Constantinople, the Ottoman caliph Mehmed is said to have ascended to the dome and the galleries in order to admire the floor, which according to Tursun Beg resembled "a sea in a storm" or a "petrified sea".[114] Other Ottoman-era authors also praised the floor; Tâcîzâde Cafer Çelebi compared it to waves of marble.[114] The floor was hidden beneath a carpet on 22 July 2020.[167]
The Imperial Gate, or Imperial Door, was the main entrance between the exo- and esonarthex, and it was originally exclusively used by the emperor.[226][227] A long ramp from the northern part of the outer narthex leads up to the upper gallery.[228]
The upper gallery, or matroneum, is horseshoe-shaped; it encloses the nave on three sides and is interrupted by the apse. Several mosaics are preserved in the upper gallery, an area traditionally reserved for the Empress and her court. The best-preserved mosaics are located in the southern part of the gallery.
The northern first floor gallery contains runic graffiti believed to have been left by members of the Varangian Guard.[229] Structural damage caused by natural disasters is visible on the Hagia Sophia's exterior surface. To ensure that the Hagia Sophia did not sustain any damage on the interior of the building, studies have been conducted using ground penetrating radar within the gallery of the Hagia Sophia. With the use of ground-penetrating radar (GPR), teams discovered weak zones within the Hagia Sophia's gallery and also concluded that the curvature of the vault dome has been shifted out of proportion, compared to its original angular orientation.[230]
The dome of Hagia Sophia has spurred particular interest for many art historians, architects, and engineers because of the innovative way the original architects envisioned it. The dome is carried on four spherical triangular pendentives, making the Hagia Sophia one of the first large-scale uses of this element. The pendentives are the corners of the square base of the dome, and they curve upwards into the dome to support it, thus restraining the lateral forces of the dome and allowing its weight to flow downwards.[231][232] The main dome of the Hagia Sophia was the largest pendentive dome in the world until the completion of St Peter's Basilica, and it has a much lower height than any other dome of such a large diameter.
The great dome at the Hagia Sophia is 32.6 meters (one hundred and seven feet) in diameter and is only 0.61 meters (two feet) thick. The main building materials for the original Hagia Sophia were brick and mortar. Brick aggregate was used to make roofs easier to construct. The aggregate weighs 2402.77 kilograms per cubic meter (150 pounds per cubic foot), an average weight of masonry construction at the time. Due to the materials plasticity, it was chosen over cut stone due to the fact that aggregate can be used over a longer distance.[233] According to Rowland Mainstone, "it is unlikely that the vaulting-shell is anywhere more than one normal brick in thickness".[234]
The weight of the dome remained a problem for most of the building's existence. The original cupola collapsed entirely after the earthquake of 558; in 563 a new dome was built by Isidore the Younger, a nephew of Isidore of Miletus. Unlike the original, this included 40 ribs and was raised 6.1 meters (20 feet), in order to lower the lateral forces on the church walls. A larger section of the second dome collapsed as well, over two episodes, so that as of 2021, only two sections of the present dome, the north and south sides, are from the 562 reconstructions. Of the whole dome's 40 ribs, the surviving north section contains eight ribs, while the south section includes six ribs.[235]
Although this design stabilizes the dome and the surrounding walls and arches, the actual construction of the walls of Hagia Sophia weakened the overall structure. The bricklayers used more mortar than brick, which is more effective if the mortar was allowed to settle, as the building would have been more flexible; however, the builders did not allow the mortar to cure before they began the next layer. When the dome was erected, its weight caused the walls to lean outward because of the wet mortar underneath. When Isidore the Younger rebuilt the fallen cupola, he had first to build up the interior of the walls to make them vertical again. Additionally, the architect raised the height of the rebuilt dome by approximately 6 m (20 ft) so that the lateral forces would not be as strong and its weight would be transmitted more effectively down into the walls. Moreover, he shaped the new cupola like a scalloped shell or the inside of an umbrella, with ribs that extend from the top down to the base. These ribs allow the weight of the dome to flow between the windows, down the pendentives, and ultimately to the foundation.[236]
Hagia Sophia is famous for the light that reflects everywhere in the interior of the nave, giving the dome the appearance of hovering above. This effect was achieved by inserting forty windows around the base of the original structure. Moreover, the insertion of the windows in the dome structure reduced its weight.[236]
Numerous buttresses have been added throughout the centuries. The flying buttresses to the west of the building, although thought to have been constructed by the Crusaders upon their visit to Constantinople, were actually built during the Byzantine era. This shows that the Romans had prior knowledge of flying buttresses, which can also be seen at in Greece, at the Rotunda of Galerius in Thessaloniki, at the monastery of Hosios Loukas in Boeotia, and in Italy at the octagonal basilica of San Vitale in Ravenna.[236] Other buttresses were constructed during the Ottoman times under the guidance of the architect Sinan. A total of 24 buttresses were added.[237]
The minarets were an Ottoman addition and not part of the original church's Byzantine design. They were built for notification of invitations for prayers (adhan) and announcements. Mehmed had built a wooden minaret over one of the half domes soon after Hagia Sophia's conversion from a cathedral to a mosque. This minaret does not exist today. One of the minarets (at southeast) was built from red brick and can be dated back from the reign of Mehmed or his successor Beyazıd II. The other three were built from white limestone and sandstone, of which the slender northeast column was erected by Bayezid II and the two identical, larger minarets to the west were erected by Selim II and designed by the famous Ottoman architect Mimar Sinan. Both are 60 m (200 ft) in height, and their thick and massive patterns complete Hagia Sophia's main structure. Many ornaments and details were added to these minarets on repairs during the 15th, 16th, and 19th centuries, which reflect each period's characteristics and ideals.[238][239]
