In October, 643, due to his sickness, Emishi handed over his rank Shikan to Iruka which allowed him to be a minister and let his second son to be Mononobe minister without the permission from the Imperial Court.
643年10月、蝦夷は病気を理由に朝廷の許しも得ずに紫冠を入鹿に授け大臣となし、次男を物部の大臣となした。