Yoriyuki then concurrently assumed the post of Military Governor of Sanuki and Tosa Provinces and the post of Shikoku Kanrei (shogunal deputy for the Shikoku region), and proceeded to drive out the Kawano clan and unify Shikoku.
代わって讃岐・土佐の守護を兼ね、四国管領に任じられ、河野氏を追討して四国を統一する。