In 757, FUJIWARA no Asakari, a son of Nakamaro, was appointed Mutsu no kami (the governor of Mutsu Province) newly building Momonou-jo Castle and Okachinoki Castle in an area which was formerly out of their control.
757年（天平宝字元年）に仲麻呂の子藤原朝狩が陸奥守となり、新たに勢力外だった土地に桃生城および雄勝城を建設した。