Behind the rebellion, there was a disagreement between Tokimasa and Tomomasa (provincial governor of Musashi province) and the Hatakeyama clan (acting provincial governors of Musashi province) over rule of the province.
乱の背景には武蔵国の支配を巡り、留守所畠山氏と国司朝雅を背景とした時政との対立があった。