承久之亂
In 1221, the Jōkyū War occurred. Cloistered emperor Go-Toba, disillusioned with the Hōjō, declared Regent Yoshitoki an outlaw and wanted him executed. Kyoto was now in open rebellion, Yoshitoki ordered his troops to attack Kyoto, and the city was taken in 1221. Masako helped discover the plot. Go-Toba was exiled to the Oki Islands. Yoshitoki's son, Hōjō Yasutoki, took the capital.