Yoshioki OUCHI, who succeeded to Masahiro OUCHI, established a hegemony in northern Kyushu and Chugoku regions, as well as driving the Shoni clan to a temporary fall, and consolidated the base of his power.
大内政弘の後を継いだ大内義興は、少弐氏を一時滅亡に追いやるなど北九州・中国地方の覇権を確立し、その勢力基盤を確固たるものとした。