Prince Naka no Ōe cut down Soga no Iruka at court in 645, Iruka's father burned the court histories as he died, and a 646 edict abolished private estates

The main line of the Soga clan dominated the Yamato court for generations. In 645, while a memorial from the three Korean kingdoms was being read in the palace hall, Prince Naka no Ōe struck Soga no Iruka, and hired swordsmen finished him. Nakatomi no Kamatari had planned the attack with the prince. The next day the guards deserted Iruka's father, Soga no Emishi. He set fire to his own house and killed himself. Two court histories, the Tennōki and the Kokki, said to have been compiled in 620 by Prince Shōtoku and Soga no Umako, burned in the house. A scribe, Fune no Esaka, pulled the Kokki from the fire and gave it to Naka no Ōe. The main Soga line ended. In the first month of 646 a reform edict abolished the private lands and estates of the court and the clans and the people bound to them, and gave the clans stipends instead. It set up household registers and the periodic allotment of rice land. Japanese reference works note that the edict text in the Nihon Shoki was edited by its compilers; one word in it comes from the later Taihō code. Scholars dispute whether the text was embellished or invented, and the embellishment view is favoured. Naka no Ōe later reigned as Emperor Tenji. Neither the Tennōki nor the rescued Kokki survives.