The Church of St. George (Greek: Καθεδρικός ναός του Αγίου Γεωργίου, Kathedrikós Naós tou Agíou Geōrgíou, Turkish: Aya Yorgi) is the principal Greek Orthodox cathedral still in use in Istanbul, the largest city in Turkey and (as Constantinople), the capital of the Byzantine Empire until 1453 (...) (from Wikipedia)