His father was born at second position in the kayi tribe at this time the emperor of the tribe Sulaiman Shah. Ertughrul Ghazi was one of the best emperor of kayi tribe .He have three main friends Bamsi ,Turgut and Duan who gives their lives to him.Turgut was known as hammer man ,Bamsi was kown as 2 double hand man and duan was known as one handed man .Fist of all the Ertughrul Ghazi the father of Usman saved the emperor of Konia the brother of Sultan Alauddin who was the emperor of Konia from karatwegar(the name of first enemy of Ertughrul Ghazi).He also killed the brother of the soldier of Qila of that time salebies and that time found his love Halima who was the daughter of the sultan.The Kayi tribe treated the Sultan very well.When the father of Ertughrul Ghazi died they strong their relation ship with another tribe of Muslims .In that area the Mongols are at very high in power they attack the Kayi Tribe and killed a lot of people .When they rached the another tribe they treated them very well.After all they faught many times with mongols and at last the Emperor the Ertughrul Ghazi killed the leader of Mongols who was Noyan.