Amid growing complaints about the Taira tyranny, Yorimasa planned to take up arms against the Taira family in conjunction with Prince Mochihito and conveyed the Prince's message to topple the Taira's administration to all the Minamoto clan samurai throughout the whole country.
だが、平家の専横に不満が高まる中で、以仁王と結んで平家打倒の挙兵を計画し、諸国の源氏に平氏打倒の令旨を伝えた。