Ortaköy Mosque (Ortaköy Camii), officially the Büyük Mecidiye Camii (Grand Imperial Mosque of Sultan Abdülmecid) in Istanbul, Turkey. Originally built in 1721 then demolished. Sultan Abdülmecid ordered Armenian father and son architects Garabet Balyan and Nigoğayos Balyan to rebuilt it in Neo-Baroque style. Construction finished in 1856. The Calligraphic Works in the Mosque belong to Sultan Abdülmecid, himself.