After the mid Heian Period, they were appointed privately from a Court noble, Kanjin (low to medium rank government official), or Jigenin (lower rank of ancient Japanese nobility), and the system that personnel of the national government double as Keishi, private household management personnel, was formed.
平安時代中期以後は公卿・官人・地下人の中から私的に任用され、国政機関の職員が権門の私的な家政職員である家司を兼ねる仕組が形成された。