He built up power over the Bando region, and the branch family of Bando-Heishi (Taira clan) Ise-Heishi (Taira clan) established matrimonial relations to form strong samurai groups, and won the Hogen War and the Heiji War and enjoyed prosperity, but they were defeated in the Jisho-Juei War and then disappeared.
坂東に勢力を築き、坂東平氏の庶流である伊勢平氏が姻戚関係を持って有力な武士団を形成、保元の乱・平治の乱を制し栄華を誇ったが、治承・寿永の乱に敗れて滅亡した。