istanbul(n = noun.location) constantinople, stamboul, stambul - the largest city and former capital of Turkey; rebuilt on the site of ancient Byzantium by Constantine I in the fourth century; renamed Constantinople by Constantine who made it the capital of the Byzantine Empire; now the seat of the Eastern Orthodox Church;
A city in European Turkey, built on the site of ancient Byzantium. It is the former capital of the Turkish Empire, known as Constantinople before being captured by the Turks. [WordNet 1.5]