The retired Emperor Shirakawa, in order to design and carry out his policy, made middle-class aristocracy Inshi (official of the In no cho, or Retired Emperor's Office), and placed Hokumen no Bushi (the Imprerial Palace Guards) as his own military force.
白河上皇は、自らの政策を企画・遂行するために中流貴族を院司とし、また院独自の軍事力として北面の武士を置いた。