Capital Cities

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

More Questions from Capital Cities
Which Asian country's capital city has over 9 Million people living there?
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Prague is the capital of what country?
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Which country has Nuku'alofa as its capital?
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Which country is Tbilisi the capital of?
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Papeete is the capital of what country?
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Which of the following South Pacific Island capitals is not set on the Coral Sea?
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Madison is the capital of which U.S. state?
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What country in Oceania, with Matu-Utu (on Ile Uvea) as its capital, uses the franc as its currency?
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