The Church of the Holy Saviour in Chora was built in the 4th century by Constantine the Great. The mosaics and frescoes date from about 1320.

For four centuries after the Ottoman conquest of Istanbul, it served as a mosque (Kariye Camii), and was converted into a museum in 1948 (Kariye Müzesi). — The Wikipedia and Church of the Holy Savior in Chora