This coup occurred because Mitsusuke AKAMATSU, who could not endure the pressure, assassinated Shogun Yoshinori at his residence and later he withdrew from the capital to fight back in Harima province.
これは圧迫に耐えかねた赤松満祐が自邸で将軍義教の暗殺を行うと言う形で起こされたもので、その後京を引き上げた満祐は播磨で抗戦の構えをみせた。