Originally, the Kamakura bakufu was established based on master-servant relationship between the Kamakura-dono (lord of Kamakura) and the Gokenin, however the Soryo system (the eldest son system for the succession of the head of the family) was getting bogged down.
本来鎌倉殿と御家人の主従関係で成り立っていた幕府内部において、総領制が行き詰まった。