When the Aya Sofia, or Hagia Sophia, was built between 532 and 537, it served as an Orthodox basilica, then when the Ottoman Turks conquered Constantinople in 1453, it was converted to a mosque. Now it is a museum. During the time that it was a mosque, most of the mosaics were plastered over. This image shows the Theotokos (Virgin Mother and Child) mosaic, along with one of the medallions showing an Islamic inscription.