During the period of the Northern and Southern Courts (Japan), Nobutake Takeda, then the shugo of Aki Province, followed Takauji ASHIKAGA, achieved distinguished war service at various battle fields and became the shugo of Kai Province in place of the Takeda clan of Isawa lineage.
その後南北朝時代(日本)には安芸守護であった武田信武が足利尊氏に属して各地で戦功をあげ、石和系武田氏に代わり甲斐国守護となった。