Answer:
It fell to the Roman Republic in 196 BC, and was known as Byzantium until 330, when it was renamed Constantinople and made the new capital of the Roman Empire. During late antiquity, the city rose to be the largest of the western world, with a population peaking at close to half a million people.After the barbarians overran the Western Roman Empire, Constantinople became the indisputable capital city of the Roman Empire. Emperors were no longer peripatetic between various court capitals and palaces. ... The wealth of the eastern Mediterranean and western Asia flowed into Constantinople.
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