In 815, ONO no Himi was appointed as seito vice shogun Mutsu no suke (vice shogun who subdues the eastern barbarians, and assistant governor of Mutsu Province); like this, appointments of vice shogun for the sake of conquest of Ezo in Ou were done several times.
弘仁6年（815年）にはさらに征東副将軍陸奥介に小野氷見が任ぜられており、たびたび奥羽の蝦夷征伐の人事がなされた。