One cause of the downfall of the Minamoto clan was the conspiracy in the cloister government, while another was the secret infighting going on within the Minamoto clan; in such infighting among the Minamoto clan, the major figure was Yoshimitsu.
源氏の凋落は院政の陰謀も原因であるが、源氏内部での暗闘も衰退の原因であり、その内部の暗闘の中心人物は義光であった。