Probably because of this, he is appointed as Assistant Governor of Kozuke Province by New Emperor Masakado in "Soma Keizu," but in other documents such as "Shomon ki" (The Chronicle of Masakado) TAJI no Tsuneakira is appointed as Assistant Governor of Kozuke Province, not Masahira.
それが原因であるのか、『相馬系図』では新皇将門によって上野介に任ぜられているが、『将門記』などの書物では上野国は上野守に任ぜられた多治経明の任国となっていて将平の名はない。