During the Battle of Enkyu Ezo, which began in 1070 by the Imperial order of Emperor Gosanjo, he stole the Governor's seal and the key of the provincial shoso (public repository) and ran away from the province while MINAMOTO no Yoritoshi, the Governor of Mutsu Province, was away from the province in battle.
延久2年（1070年）に後三条天皇の勅命により始まった延久蝦夷合戦で、陸奥国司源頼俊が出陣中に、国司の印と国の正倉の鍵を奪い、逃走する。