After the death of the retired Emperor Toba in the middle of the 12th century, a political fight for the seat of chiten no kimi occurred, which involved the Emperor's family and Sekkan-ke, and was resolved after a military confrontation (the Hogen War).
12世紀中期に鳥羽上皇が没すると、治天の君の座を巡って天皇家・摂関家を巻き込む政争が起こり、軍事衝突によって解決した（保元の乱）。