Capital Cities

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

More Questions from Capital Cities
What is the capital of Latvia and the largest city of the Baltic states?
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Which country with a total area of 2,860 square kilometers has Apia as its capital city?
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Which country is Tbilisi the capital of?
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N'Djamena is the capital of which country?
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What is the capital of Serbia?
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Buenos Aires, which translates to "fair winds", is the capital of which South American country?
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Which country with a total area of 259 square kilometers has George Town as its capital city?
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Banjul is the capital of which of the following African countries?
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