The Ronin uprising in Nukata County broke out by Maruyama Nakatsukasa nyudo and Jirozaemon ONIWA, etc. in 1465, and Shigeyuki thought that Nobumitsu MATSUDAIRA and Munemitsu TODA (Zenkyu), subordinates of the Mandokoro Shitsuji (chief of Mandokoro, the Administrative Board), Sadachika ISE, would pull the strings behind the scenes.
1465年に丸山中務入道や大庭二郎左衛門らの額田郡牢人一揆が起きたが、成之はその裏で糸をひいているのが政所執事　伊勢貞親の配下松平信光と戸田宗光（全久）とみた。