In 1552, defeated by Ujiyasu HOJO, Norimasa UESUGI, Kanto Kanrei, fled to Echigo Province, and proposed that he would hand over the head post of the Uesugi family and the Kanto Kanrei post to Kagetora.
天文21年（1552年）、北条氏康に敗れた関東管領・上杉憲政は越後国へ逃れ、景虎に上杉氏の家督と関東管領職の譲渡を申し入れていた。