In case of Yoriyoshi, four generations of the Minamoto clan, from the earliest ancestor, MINAMOTO no Tsunemoto to his father, held the post of Chinju-fu shogun, and when the Abe clan (in Oshu, northern Japan), who was the chief of Fushu (subdued Ezo) and the autonomous ruler of Okuroku-gun (six counties in northern Japan), conflicted with kokufu, Yoriyoshi was also dispatched as Mutsu no kami and Chinju-fu shogun and subdued them in 12 years.
頼義は源氏始祖の源経基以来、父の代まて4代にわたり鎮守府将軍を歴任しており、蝦夷の俘囚長で奥六郡の支配者である安倍氏(奥州)が国府と対立した際、これを平定するため陸奥守・鎮守府将軍として派遣され、12年の歳月を経て平定した。