Capital Cities

What Turkish city has been the capital of three major empires: Roman, Byzantine and Ottoman?

More Questions from Capital Cities
What city's current name is believed to have come from the Korean word for "capital city", "Seorabeol"?
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What country in South America with Santiago as its capital uses peso as its currency?
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What city is the capital of Papua New Guinea?
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What is the capital city of the Mexican state of Nuevo Leon?
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Which country is Alofi the capital of?
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What is the third-highest capital city in South America at 2,640 meters above sea level?
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Which city in Ukraine was once the center of Vladimir I's Viking state?
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India's capital Delhi stands along the banks of what river?
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