İstanbul ĭs˝tănbo͞ol´, ĭstan´bo͞ol [key], city (1990 pop. 6,748,435) and metropolitan muncipality, capital of İstanbul prov., NW Turkey, on both sides of the Bosporus at its entrance into the Sea of Marmara. Since 2004 the metropolitan municipality and province have been coterminous. Its name was officially changed from Constantinople to İstanbul in 1930; before AD 330 it was known as Byzantium. (For the history of the city, see Byzantium and Constantinople.)
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