Ertuğrul
Ertuğrul or Ertuğrul Ghazi (Ottoman Turkish: ارطغرل, romanized: Erṭoġrıl; died c. 1280/1281) was a 13th-century uch bey (marcher-lord), who was the father of Osman I. Little is known about Ertuğrul's life. According to Ottoman tradition, he was the son of Suleyman Shah, the leader of the Kayı tribe (a claim which has come under criticism from many historians) of the Oghuz Turks (then known as Turkomans), which fled from western Central Asia to Anatolia to escape the Mongol conquests; but according to contemporary numinastic evidence, he was the son of Gündüz Alp.