Istanbul

Istanbul, Turkish İstanbul, formerly Constantinople, ancient Byzantium ,  largest city and seaport of Turkey. It was formerly the capital of the Byzantine Empire, of the Ottoman Empire, and—until 1923—of the Turkish Republic.

The old walled city of Istanbul stands on a triangular peninsula between Europe and Asia. Sometimes as a bridge, sometimes as a barrier, Istanbul for more than 2,500 years has stood between conflicting surges of religion, culture, and imperial power. For most of those years it was one of the most coveted cities in the world.

The name Byzantium may derive from that of Byzas, who, according to legend, was leader of the Greeks from the city of Megara who captured the peninsula from pastoral Thracian tribes and built the city about 657 bce. In 196 ce, having razed the town for opposing him in a civil war, the Roman emperor Septimius Severus rebuilt it, naming it Augusta Antonina in honour of his son. In 330 ce, when Constantine the Great dedicated the city as his capital, he called it New Rome. The coinage, nevertheless, continued to be stamped Byzantium until he ordered the substitution of Constantinopolis. In the 13th century Arabs used the appellation Istinpolin, a “name” they heard Byzantines use—eis tēn polin—which, in reality, was a Greek phrase that meant “in the city.” Through a series of speech permutations over a span of centuries, this name became Istanbul. Until the Turkish Post Office officially changed the name in 1930, however, the city continued to bear the millenary name of Constantinople. Pop. (2007) 10,757,327; (2012 est.) urban agglom., 13,301,345.

Aspects of the topic Istanbul are discussed in the following places at Britannica.

Articles from Britannica encyclopedias for elementary and high school students.

Istanbul - Children's Encyclopedia (Ages 8-11)

Istanbul is the largest city in the country of Turkey. A channel of water called the Bosporus divides the city into two parts. One part of Istanbul is in Europe, while the other part is in Asia.

Istanbul - Student Encyclopedia (Ages 11 and up)

For centuries the ancient city of Istanbul was known as Constantinople, the name it was given when it became the capital of the Eastern Roman Empire. While it is no longer a capital city, Istanbul is still the cultural center of modern Turkey. It straddles the Bosporus, a narrow strait that divides the continents of Europe and Asia-a strategic location that has made it the largest city and seaport of the Turkish republic.