At the Jinshin War of 672, Kunimi supported Oama no Miko (Oshiama no Miko or Prince Oama who became Emperor Tenmu following the victory in the war), and he served three consecutive generations of Emperor Tenmu, Empress Jito and Emperor Monmu.
天武天皇元年（672年）の壬申の乱では大海人皇子（天武天皇）方に付き、天武・持統・文武の三代の天皇に仕えた。