During the middle of the tenth century, the administration of kokuga came to be managed by zaichokanjins, some of the zuryos did not go to their place of assignment and often left administration to the zaichokanjins.
10世紀中期頃、国衙行政は在庁官人の手で運営されるようになり、受領の中には任国へ赴任せず、在庁官人へ行政を任せる者も多くなっていった。