Osman I
Osman I or Osman Ghazi (;  or Osman Gazi; died 1323/4), sometimes transliterated archaically as Othman, was the founder of the Ottoman Empire (first known as the Ottoman Beylik or Emirate). While initially a small Turkoman principality during Osman's lifetime, his beylik transformed into a world empire in the centuries after his death. It existed until shortly after the end of World War I.