When the anti-shogunate movement by the Emperor Godaigo developed into the Genko War in 1333, which was in the late Kamakura period, Koretoki ASO received ryoji (an order) from the Imperial Prince Morinaga and cooperated with Takauji ASHIKAGA to attack Rokuhara Tandai (an administrative and judicial agency in Rokuhara, Kyoto).
鎌倉時代後期の1333年（元弘3）に後醍醐天皇の討幕運動から元弘の乱が起こると、阿蘇惟時は護良親王の令旨を受け、足利尊氏らと京都の六波羅探題攻めに参加する。