Istanbul is a world center of great importance in the past and present. The city embraces Asia on the one hand and Europe on the other. Istanbul is Turkey's most populous city and its cultural and financial center. Located on both sides of the Bosphorus, the narrow strait between the Black Sea and the Marmara Sea, Istanbul bridges Asia and Europe both physically and culturally. With its historical peninsula, numerous scenic and historical sites, Istanbul is a magnificently unique city that has been the capital to many civilizations from past to present and still continues to be home to residents from all over the world. Istanbul's population is estimated between 12 and 19 million, making it one of the largest cities in Europe and the world.
The history of the city proper begins around 660 BCE, when Greek settlers from Megara established Byzantium on the European side of the Bosphorus. The settlers built an acropolis adjacent to the Golden Horn on the site of the early Thracian settlements, fueling the nascent city's economy. The city experienced a brief period of Persian rule at the turn of the 5th century BCE, but the Greeks recaptured it during the Greco-Persian Wars. Byzantium then continued as part of the Athenian League and its successor, the Second Athenian League, before gaining independence in 355 BCE. Long allied with the Romans, Byzantium officially became a part of the Roman Empire in 73 CE.Byzantium's decision to side with the Roman usurper Pescennius Niger against Emperor Septimius Severus cost it dearly; by the time it surrendered at the end of 195 CE, two years of siege had left the city devastated.[43] Five years later, Severus began to rebuild Byzantium, and the city regained—and, by some accounts, surpassed—its previous prosperity.
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