Such heredity system through reigns of the family was also seen within the Imperial Family, and Insei (rule by the retired Emperor), which intermittently continued from the retired Emperor Shirakawa until the Muromachi period for form's sake, can be seen as heredity of household management within the Imperial Family.
またこのような家督を通じての世襲化はじつに天皇家内部においても見られ、白河上皇以後形式的には室町期にまで断続的に続く院政は天皇家における家政の世襲化とみることができる。