Κωνσταντινούπολις , Konstantinoúpolis , or ἡ Πόλις hē Pólis , Latin : CONSTANTINOPOLIS , in formal Ottoman Turkish : قسطنطينيه Konstantiniyye ) was the imperial capital ( Gr : Βασιλεύουσα , Basileúousa ) of the Roman Empire (330–395), the Byzantine/Eastern Roman Empire (395–1204 and 1261–1453), the Latin Empire (1204–1261), and the