After middle of thirteenth century, there was a conflict between Emperor Gofukakusa's line (Jimyoin Imperial line) and Emperor Kameyama's line (Daikakuji Imperial line) to succeed to the next position of Chiten, but Emperor Gosaga died and left his will to have Emperor Kameyama's line succeed to the throne, Emperor Gofukakusa's line was against it and asked the bakufu to support their force.
13世紀中期には、次代の治天の座を巡って後深草天皇の系統（持明院統）と亀山天皇の系統（大覚寺統）が対立したが、治天である後嵯峨天皇は亀山系による皇位継承を遺言して没し、後深草系はこれに反発して幕府に力添えを頼んだ。