Moreover, Yoshimitsu was also bent on weakening the most powerful of the shugo daimyo, and in 1379, he skillfully exploited the conflict between the Hoskawa and Siba families to engineer the overthrow of the powerful Kanrei, Yoriyuki HOSOKAWA (in what became known as the Koryaku coup).
また、義満は有力守護大名の弱体化を図り、康暦元年（1379年）、細川氏と斯波氏の対立を利用して管領細川頼之を失脚させた（康暦の政変）。