In June of the Jinshin year under the Oriental zodiac system (672), Oama no oji rose in arms against Otomo no oji (Prince Otomo, the Emperor Kobun) who then sent a messenger to Wakyo (倭京, also read as Yamato no miyako) to organize an army.
壬申の年（672年）の6月に大海人皇子が挙兵すると、近江宮にいた大友皇子（弘文天皇）は倭京に使者を派遣して軍を編成させた。