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Origins of the Ottoman Empire
In 1453, Mehmed II the Conqueror led the Ottoman Turks in seizing the ancient city of Constantinople, the Byzantine Empire's capital. This put an end to 1,000-year reign of the Byzantine Empire. Sultan Mehmed renamed the city Istanbul and made it the new capital of the Ottoman Empire

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Mainly the erosion of the East Roman Empire and Persian Empire's Military strength after constant wars with each other. The Arab Caliphates weakened the two empires beyond repair, and the Turks took them both over. The Ottomans used the Roman's roads to conquer Europe through Anatolia and Thrace

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