Intimate relations were cemented with a section of the Soga through Kurayamada, whose daughter Prince Naka married, and trustworthy followers having been attached to the prince, the conspirators watched for an occasion. It was not easy to find one.
Prince Naka's name must go down to all generations as that of a great reformer, but it is also associated with a terrible injustice. Too readily crediting a slanderous charge brought against his father-in-law, Kurayamada, who had stood at his right hand in the great coup d'etat of 645, he despatched a force to seize the alleged traitor.
Iruka having been beguiled into laying aside his sword, the reading of the memorials was commenced by Kurayamada, and Prince Naka ordered the twelve gates to be closed simultaneously. At that signal, two swordsmen should have advanced and fallen upon Iruka; but they showed themselves so timorous that Prince Naka himself had to lead them to the attack.
Kurayamada fled to a temple, and there, declaring that he would "leave the world, still cherishing fidelity in his bosom," he committed suicide, his wife and seven children sharing his fate. Subsequent examination of his effects established his innocence, and his daughter, consort of Prince Naka, died of grief.