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The Church of Saints Sergius and Bacchus was erected by Justinian between 527 and 536 as a thank-offering.The two soldier-saints allegedly appeared to the emperor Anastasius I to intercede for Justinian, who had been condemned to death for conspiracy.
They were Atik Sinan (the Elder), Sinan of Balıkesir, and Mimar Koca Sinan (Great Architect Sinan).The church was burned again in the Nika Insurrection of 532 and reconstructed by Justinian.The structure now standing is essentially the 6th-century edifice, although an earthquake tumbled the dome in 559, after which it was rebuilt to a smaller scale and the whole church reinforced from the outside. In 1453 it became a mosque with minarets, and a great chandelier was added. The walls are still hung with Arabic calligraphic disks.The Church of the Holy Saviour in Chora, which was converted into the Kariye Mosque, is near the Adrianople Gate.
It was restored in the 11th century and remodeled in the 14th; the building is now a museum renowned for its 14th-century mosaics, marbles, and frescoes.Nothing remains of the Byzantium that Constantine chose as the site of New Rome, and almost nothing is left of the mighty city he built there.