Ertuğrul

Ertuğrul or Ertuğrul Ghazi 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 of the Oghuz Turks, which fled from western Central Asia to Anatolia to escape the Mongol conquests; but according to contemporary numinastic evidence, he was the son... (Wikipedia)