Осман I, also known as Osman Gazi, was the founder of the Ottoman Empire. He was born around 1258 and ruled from 1299 until his death in 1326. His leadership marked the beginning of a dynasty that would last for over six centuries. Osman I united various tribes in Anatolia and expanded his territory through military conquests. Osman I is often credited with establishing the administrative and military foundations of the Ottoman state. His legacy includes the development of a strong army and the promotion of trade and culture. The empire he founded would grow to become one of the most powerful in history.