The Soga clan prided reins of power surpassing the great king (the Imperial Family in later years) and he even tried to become the great king (Yamato sovereignty, the ancient Japan sovereignty) so, according to "Nihonshoki," (Chronicles of Japan) he was destroyed in the Isshi no hen (the Murder in the Year of Isshi).
蘇我氏は大王家（後の天皇家）を凌ぐ権勢を誇り、遂には自身が大王(ヤマト王権)になろうとしたため、乙巳の変により滅ぼされたと『日本書紀』が伝えている。