Go Sannen no Eki was considered as a private battle between the members of the Kiyohara clan, and no reward nor court rank was awarded to Kiyohira, but he became a powerful man possessing six counties in Mutsu Province as the last survivor of the family.
後三年の役は清原氏の私闘とされ、何の恩賞もなく清衡にも官位の賞与も無かったが、一族最後の残存者として奥六郡を領する勢力者となった。