The Kamakura kubo Ashikaga clan and the Kanto kanrei Uesugi clan became at odds, and the Eikyo War occurred in 1439, where the Kanto kanrei sided with shogun Yoshinori ASHIKAGA.
鎌倉公方足利氏と関東管領上杉氏はやがて対立し、1439年の永享の乱では関東管領は将軍足利義教方についた。