During the Kamakura period, jito made an aggressive attempt to control soen and koryo, and in particular, they focused on acquisition of the right to control shitaji (shitaji-shinshi ken - the right to appropriate land).
鎌倉時代、地頭は、荘園公領支配への進出を積極的に展開したが、特に下地の支配権（下地進止権という）の獲得に力を注いだ。