Since the Kamakura period, as a general rule, the conferments of a court rank and appointment to an office of samurai who were shogunal retainers were reported to the Imperial Court via the lord of Kamakura, and it was strictly prohibited for the shogunal retainers to receive a rank and office directly from the Imperial Court.
鎌倉時代以降、鎌倉幕府の御家人たる武士の叙位任官は鎌倉殿を通じて朝廷に具申することを原則として、御家人が直接的に朝廷から叙位任官を受けることを厳禁とした。