Ōuchi Yoshinaga (大内 義長, 1532 - May 1, 1557) was a 16th century Kyushu warrior who was invited by Sue Harukata, who had just taken control of the Ōuchi clan, to serve as the official head of the Ōuchi while Sue pulled the strings from behind. Yoshinaga was the younger brother of Ōtomo Yoshishige. Following Mōri Motonari's victory over Sue in 1555 at Miyajima, Yoshinaga's position became quite vulnerable. Yoshinaga was forced to commit suicide in 1557, effectively causing the Ōuchi clan to become extinct.
The Samurai Sourcebook