Capital Cities

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

More Questions from Capital Cities
Charleston is the capital city of which U.S. state?
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Budapest is the capital of which country?
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In which capital city would you find the Templo Mayor?
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Which country with a total area of 45,226 square kilometers has Tallinn as its capital city?
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Vilnius is the capital of which country?
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Jamestown is the capital of which country?
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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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Which of these is NOT located in the capital city of Tokyo?
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