Yoshimitsu didn't stop his policy to weaken major shugo daimyo clans, and in 1391, the Yamana family, who had dominated eleven pronices and was even called "Rokubunno-Ichi dono (literally, the lord who has one sixth of the country) was conquered by the Meitoku War.
義満の有力守護大名弱体化政策は続けられ、明徳2年（1391年）には11カ国を領して『六分の一殿』と呼ばれた山名氏一族が征伐された（明徳の乱）。