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Hagia Sophia, (the Church of) Holy Wisdom, now known as the Ayasofya Museum, was an early Christian Church and later an Eastern Orthodox church which was transformed into a mosque in 1453 by the Turks, [2] and converted into a museum in 1935. It is located in Istanbul, Turkey. It is regularly considered one of the greatest, and most beautiful buildings in history. Its conquest by the Ottomans at the fall of Constantinople is considered one of the great tragedies of Christianity by the Greek Orthodox faithful.
The name comes from the Greek name , meaning "Church of the Holy Wisdom of God". It is also known as Sancta Sophia in Latin and Ayasofya in Turkish. Although it is sometimes called "Saint Sophia" in English, it is not named after a saint named Sophia — the Greek word sofia means "wisdom."
It was constructed in five years, from 532 to 537, at the orders of Emperor Justinian I and designed by Isidore of Miletus.
Hagia Sophia is covered by a central dome with a diameter of 31 meters (102 feet) and 56 meters high, slightly smaller than the Pantheon's. The dome seems rendered weightless by the unbroken arcade of arched windows under it, which help flood the colourful interior with light.
The dome is carried on pendentives — four concave triangular sections of masonry which solve the problem of setting the circular base of a dome on a rectangular base. At Hagia Sophia the weight of the dome passes through the pendentives to four massive piers at the corners. Between them the dome seems to float upon four great arches.
At the western (entrance) and eastern (liturgical) ends, the arched openings are extended by half domes carried on smaller semidomed exedras. Thus a hierarchy of dome-headed elements builds up to create a vast oblong interior crowned by the main dome, a sequence unexampled in antiquity. All interior surfaces are sheathed with polychrome marbles, green and white with purple porphyry and gold mosaics, encrusted upon the brick. On the exterior, simple stuccoed walls reveal the clarity of massed vaults and domes.
Following the building's conversion to a mosque in 1453, many of its mosaics were destroyed or covered with plaster, due to Islam's ban on representational imagery. This process was not completed at once, and reports exist from the 17th century in which travellers note that they could still see Christian images in the former church. In 1847-49, the building was restored by two Swiss brothers, Gaspare and Guiseppe Fossati, and Sultan Abd?lmecid allowed them to also document any mosaics they might discover during this process. This work did not include repairing the mosaics and after recording the details about an image, the Fossatis painted it over again. This work included covering the previously uncovered faces of two seraphim mosaics located in the centre of the building. The building currently features a total of four of these images and two of them are restorations in paint created by the Fossatis to replace two images of which they could find no surviving remains. In other cases, the Fossatis recreated damaged decorative mosaic patterns in paint, sometimes redesigning them in the process. The Fossati records are the primary sources about a number of mosaic images now believed to have been completely or partially destroyed in an earthquake in 1894. These include a great mosaic of Christ Pantocrator in the dome, a mosaic over a now unidentified Door of the Poor, a large image of a jewel-encrustred cross and a large number of images of angels, saints, patriarchs, and church fathers. Most of the missing images were located in the building's two tympana. The Fossatis also added a pulpit (minbar) and the four large medallions on the walls of the nave bearing the names of Muhammad and Islam's first caliphs.
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