But in 1457, the gonancho forces were essentially ruined when they were betrayed by the surviving retainers of the AKAMATSU clan, who were seeking to restore the clan after their annihilation in the Kakitsu rebellion; the Southern Court descendants, the brothers Jitenno and Chugio, were assassinated, and the Grand Jewels were restolen.
後南朝は、嘉吉の乱で滅亡した赤松氏の再興を目指す赤松遺臣によって、1457年（長禄元年）に南朝後裔の自天王・忠義王なる兄弟が殺害され、神璽が奪還されることによって、実質的に滅亡した。