Capital Cities

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

More Questions from Capital Cities
Which of these continent - country - capital groups is correct?
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Little Rock is the capital city of which U.S. state?
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Reunion Island, part of the Mascarene Islands in the Indian Ocean, boasts which capital city?
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Sarajevo is the capital of which country?
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What is the state capital of Colorado?
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Which country with a total area of 41,526 square kilometers has Amsterdam as its capital city?
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What is the state capital of Arizona?
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Which country is Tbilisi the capital of?
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