Mitsumori Ōuchi

Mitsumori Ōuchi was the 18th head of the Ōuchi clan of Suō Province, succeeding his father Hiromori. He styled himself Ōuchinosuke, and from his day the clan heads took the title Suō no gon-no-suke.

In 1206 he founded the temple Zuiun-ji at Shiraishi in Yamaguchi, the family's first foothold in the Yamaguchi basin where the Ōuchi would later centre their power. After his death the headship passed to his son Hironari.