His grandfather TAIRA no Yoshifumi settled in Muraoka, Musashi Province and called himself Goro MURAOKA, who possessed shoryo (territory) in the greater part of Soma County, Shimousa Province.
祖父の平良文は武蔵国村岡に土着して村岡五郎と称して、下総国相馬郡(下総国)の大半を所領とした。