During the war with the Southern Court, Yoriyuki battled against some of the powerful Kokujin (including the Ogasawara clan of Awa and Kawano clan of Iyo) and gradually tightened his control over his territory in Shikoku.
南朝側との戦い、阿波の小笠原氏や伊予の河野氏、国人勢力らとの戦いの中で次第に四国における領国支配体制を固める。