The actual ruler was the Onakatomi clan, a descendent of kaihatsu ryoshu (local notables who actually developed the land) ONAKATOMI no Nobukiyo, but the clan collapsed due to an internal conflict during the Kamakura period.
事実上の支配者は開発領主大中臣信清を祖とする大中臣氏だが、鎌倉時代に内紛で没落した。