The city of Istanbul, located on the Bosphorus Strait between the Mediterranean and the Black Sea, lies partly on the European and partly on the Asian continent. The city was founded by the Greek in 667 BC and was called Byzantium. Constantine I (the Great) made the city the capital of the Eastern Roman Empire in 330, and the city was renamed Constantinople after him. In 1453 Sultan Mehmed II took the city, and it became the capital of the Ottoman Empire until 1922. In 1930 the city was officially renamed to Istanbul.