After the death of the first shogun, MINAMOTO no Yoritomo, his right hand, Kagetoki KAJIWARA, was expelled from the bakufu due to the letter of covenant prepared by 66 gokenin (immediate vassals of the shogunate) with common interests, and his clan was ruined.
初代将軍源頼朝の死後に腹心であった梶原景時が御家人66名による連判状によって幕府から追放され、一族が滅ぼされた事件である。