Osman I or Osman Ghazi was the founder of the Ottoman Empire. 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.
Ertuğrul's türbe (tomb) in Söğüt
16th-century depiction of Osman I by Paolo Veronese
Ilkhan Mahmud Ghazan (on horseback), higher ruler of Anatolia during the early years of Osman's reign. All Turkoman Beys, or Emirs, were subordinate to him despite the inherent hostility between Turks and Mongols.
Orhan Ghazi was the second sultan of the Ottoman Empire from 1323/4 to 1362. He was born in Söğüt, as the son of Osman I.
The türbe of Orhan Gazi in Bursa
The exterior view of his türbe in Bursa.