Capital Cities

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

More Questions from Capital Cities
Which country has Damascus as its capital city?
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Situated on the Western coast of Africa, what is the capital of the Republic of Guinea-Bissau?
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What is the capital of Paraguay, a country bordering Brazil, Argentina and Bolivia?
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Providence is the capital of which U.S. state?
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Topeka is the capital city of which U.S. state?
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Thimphu is the capital of which country?
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Of which country is Colombo the capital?
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In which capital city would you find India Gate?
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