However, his real mother, Tomiko HINO, wanted to make Yoshihisa the ninth shogun, in collusion with Sozen YAMANA (Mochitoyo YAMANA), a strong feudal lord, but Yoshimi was also in collusion with the kanrei (shogunal deputy) Katsumoto HOSOKAWA; both sides resisted around the shogunate position, which contributed to the Onin War, resulting from the struggle for power between Katsumoto and Sozen as well as infighting between the Hatakeyama and Shiba families.
ところが生母の日野富子は義尚を第9代将軍にしたいと願望して当時の実力派大名であった山名宗全（山名持豊）と結託し、一方の義視も管領の細川勝元と結託して両派は将軍位をめぐって抗争し、これに勝元と宗全の権力争い、畠山氏や斯波氏の内紛なども重なって、応仁の乱の一因となった。