The Meitoku Rebellion in 1391 weakened the prominent provincial constable Yamana's clan, and with the samurai families united under Yoshimitsu, he had Yoshihiro OUCHI, who was the provincial constable of Isumi and Kii Provinces and whose property lay next to the Southern Court, to intervene and start serious negotiations.
1391年（元中8年/明徳2年）の明徳の乱で有力守護の山名氏を弱体化させ、武家勢力を統率した義満は、和泉国・紀伊国の守護で南朝と領地を接する大内義弘の仲介で本格的交渉を開始する。