In 1356, Kaneyori SHIBA, the second son of Oshutandai Iekane SHIBA, entered Yamagata as a supervisor Azechi of Dewa Province, and ruled Dewa Province where the forces of the Southern Dynasty including the Sagae clan had made their own territory; that was the beginning of Ushutandai.
正平(日本)11年（1356年）、奥州探題斯波家兼の次男・斯波兼頼が、出羽国按察使として山形に入部し、当時、寒河江氏等の南朝_(日本)勢力が割拠していた出羽国の統治に当たったのが初め。