After Yoshitada died, while the Kawachi-Genji declined in strength, Tadamori brought the Kawachi-Genji retainers with him and served for the Retired Emperor Shirakawa and the Emperor Toba.
河内源氏が義忠の死後、衰退するなか源氏の与党を従えつつ忠盛も白河上皇、鳥羽天皇に仕えた。