He fought from time to time with Motomitsu TAKEDA of Wakasa Province for control of the Tango/Wakasa region although no settlement was reached; on the contrary, it is said that the influence of the Isshiki clan declined.
若狭国の武田元光と丹後・若狭地方の支配権をめぐってたびたび争ったが、決着はつかず、かえって一色氏の勢力を衰退させたという。