After Yoshitatsu's father, Sakon no taifu (Dosan), succeeded his father Shinzaemonnojo, [Dosan] killed the heir [of the Nagai family], took over various political positions and then called himself SAITO.
義龍父の左近大夫（道三）の代になると、惣領を討ち殺し、諸職を奪い取って、斎藤の名字を名乗った。