After the fall of the Taira clan he became a powerful ally of MINAMOTO no Yoshitsune, and he worked actively to get Koreyoshi and the people of Bungo Province to side with Yoshitsune.
平家滅亡後は源義経の有力な同盟者となり、惟栄ら豊後国人の勢力を義経方に取り込むための活動にまい進。