Ienaga got the position of Jitoshiki (manager and lord of manor) in Kusakabe no sho (manor), Bicchu Province as a reward for his military exploits and this is thought to have led to forming the Honjo clan.
家長は武功をあげた恩賞として備中国草壁荘の地頭職を与えられている（この事がきっかけとなって、本庄氏が生じたと考えられる）。