When the Minamoto clan's Shoguns ended after the third one, Shoguns from regent families or royal Shoguns were installed as puppets and the regent Hojo clan held the real power.
源氏の征夷大将軍が3代で断絶すると、摂家将軍、宮将軍を傀儡に据えて執権北条氏が実権を握ることになった。