Final answer:
Osman I founded the Ottoman Empire in 1299, expanding it into Europe under subsequent rulers like Mehmet II and Suleiman the Magnificent.
Explanation:
Osman I was the leader of the Ottoman Turks and founder of the Ottoman dynasty, reigning c. 1299-1323/4. The Ottomans started as a small state in Turkey in 1299 before expanding into Europe and the Middle East under leaders like Mehmet II and Suleiman the Magnificent. In 1453, under Sultan Mehmed II, the Ottomans conquered Constantinople, renaming it Istanbul.
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