The Rise and Fall of Constantinople: From Roman Capital to Modern Metropolis
TLDR Constantinople, originally a small Greek town, became the capital of the Roman Empire in the 4th century and later evolved into a major Christian city. Despite facing numerous sieges and conflicts, it remained a center of Eastern Orthodoxy until it fell to the Ottoman Turks in 1453, after which it was informally renamed Istanbul and grew into a thriving economic center.
Timestamped Summary
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In 330, the Roman Emperor Constantine moved the capital of the Roman Empire to the small Greek town of Byzantium, which eventually became the city of Constantinople (now Istanbul).
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The city of Byzantium was settled by Greeks from Megara and changed hands between various empires before becoming the capital of the Roman Empire under the name Augusta Antonina, which was later chosen by Emperor Constantine as the location for his new capital city, Nova Roma.
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Constantinople's longevity was due to its strategic location, well-planned design, and its role as a Christian city and center of Christianity in the East.
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Constantinople remained wealthy and important despite being besieged by various enemies, and in the 8th century, Emperor Leo III outlawed the use of religious icons, which greatly influenced the city's churches, while in 1054, the great schism between the Eastern and Western churches occurred, solidifying Constantinople as the seat of Eastern Orthodoxy.
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In 1261, the Latin Empire fell apart and the Byzantine Empire was reduced to parts of western Turkey and southern Greece, but Constantinople remained the center of Eastern Orthodoxy until it fell to the Ottoman Turks in 1453.
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Constantinople's name was informally changed to Istanbul by Greek-speaking residents before the fall of the city, and after the end of the Ottoman Empire and the creation of the Turkish Republic, Istanbul grew in importance as an economic center and its population has rapidly expanded to become the 15th largest city in the world.
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The modern city of Istanbul, with its busy airport and large population, exists because of a Roman emperor's decision to establish a new capital city in the 4th century.