The founder of the Ottoman Empire was Osman I, who reigned from around 1299 to 1326. His leadership marked the beginning of a dynasty that would last over six centuries, transforming the Ottoman state from a small principality in northwestern Anatolia into a vast empire spanning three continents at its height. Osman I established a centralized government, strong military organization, and a unique legal system that helped to solidify his authority. The dynasty he founded would dominate significant parts of Europe, Asia, and Africa, leaving a lasting impact on world history and shaping the political landscape of the region.