The civilizations that built Constantinople — first the Christian Roman Empire, then the Ottoman sultans who transformed it into Istanbul.
For over 1,500 years, the city on the Bosphorus was the pivot of empires. The Byzantines made it the center of Eastern Christendom, raising Hagia Sophia as the largest cathedral on Earth. When the Ottomans conquered in 1453, they preserved its grandeur while adding minarets and mihrab — a layering of faiths visible in every stone.
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