the former capital of the Eastern Roman Empire; it was built on the site of ancient Byzantium, and the name was changed to Istanbul by the Turks.
place - The "New Rome" founded by the Emperor Constantine in 330 C.E. that served as the capitol of the Eastern Roman or Byzantine Empire. After the Ottomans occupied the city in 1453, it was renamed Istanbul.
Capital of the Ottoman empire until its collapse in 1918. The name, by which it had been known since AD 330, was changed to Istanbul in 1926.