Turkish name of Constantinople; it developed in Turkish 16c. as a corruption of Greek phrase eis tan (ten) polin "in (or to) the city," which is how the local Greek population referred to it. Turkish folk etymology traces the name to Islam bol "plenty of Islam." Greek polis "city" has been adopted into Turkish as a place-name suffix -bolu.
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Constantinople
from 330 C.E. to 1930 the name of what is now Istanbul and formerly was Byzantium, the city on the European side of the Bosphorus that served as the former capital of the Byzantine and Ottoman empires, from Greek Konstantinou polis "Constantine's city," named for Roman emperor Flavius Valerius Aurelius Constantinus (see Constantine), who transferred the Roman capital there.