In the Jinshin War of 672, KUSU no Iwate became an envoy responsible for mobilizing troops in the Province of Kibi for Prince Otomo (later Emperor Kobun), and killed the governor of the province, TAIMA no Hiroshima.
672年の壬申の乱で大友皇子（弘文天皇）ため吉備国の軍を興す使者に立ち、国守の当摩広島を殺した。