STF251929 Constantine IX Monomachus in Hagia Sophia (mosaic) by Byzantine, (11th Century); Hagia Sophia, Istanbul, Turkey; (add.info.: In this mosaic from the Eastern wall, Christ Pantocrator is flanked by Empress Zoe and her 3rd husband Constantine IX Monomachus (detail of 251928). Hagia Sophia was built in 537 as a Greek Orthodox Cathedral and converted to a mosque when the Ottoman Turks conquered Constantinople in 1453. Since 1935 it has been a museum (Unesco World Heritage List, 1985).); Bildarchiv Steffens; out of copyright.