Ertuğrul Ghazi was a 13th-century leader of the Kayi tribe of the Oghuz Turks and the father of Osman I, the founder of the Ottoman Empire. Though historical records about his life are scarce, later Ottoman chronicles provide a mix of legend and history, portraying him as a courageous warrior and an instrumental figure in the rise of the Ottomans. His contributions laid the foundation for the.