Masako, who eavesdropped through a shoji on the secret conference of the Hojo clan to subjugate Yoriie on his sickbed and Yoshikazu, informed Tokimasa of the plot. Tokimasa called Yoshikazu to his residence and killed him in order to preempt the plan. Then he attacked the residence of Ichiman, destroying the relatives of the Hiki clan and Ichiman was also burned to death' (Azuma Kagami on the section under September 2nd (October 15 of the current calendar)).
「病床の頼家と能員による北条氏討伐の密議を障子の影で立ち聞きしていた政子が時政に報告し、先手を打った時政は自邸に能員を呼び出して殺害、一幡の屋敷を攻め、比企一族を滅ぼし一幡も焼死した」（9月2日条）としている。