Ōuchi clan

Ōuchi clan 大内氏
The emblem (mon) of the Ōuchi clan
Home province	Suō
Titles	Various
Final ruler	Ōuchi Yoshinaga
Dissolution	1557
Ruled until	1557, Ōuchi Yoshinaga commits seppuku

Ōuchi clan (大内氏, Ōuchi-shi^?) was one of the most powerful and important families in Japan during the reign of the Ashikaga shogunate in the 12th to 14th centuries. Their domains, ruled from the castle town of Yamaguchi, comprised six provinces at their height, and the Ōuchi played a major role in supporting the Ashikaga in the Nanboku-cho Wars against the Imperial Court. The Ōuchi remained powerful up until the 1560s, when they became eclipsed by their vassals, the Mōri clan.

Based in Suō Province, towards the western end of Honshū, the Ōuchi were among the primary families to be involved in foreign trade and relations, particularly with China. Following the Ōnin War (1467–1477), a strong rivalry developed between the Ōuchi and the Hosokawa family, who were now in power. The two clashed at Ningbo in 1523, and as a result the Chinese closed Ningbo to Japanese traders. After the incident, the Ōuchi ships were only allowed to trade in China in 1540 and 1549. The Ōuchi also housed the Portuguese Jesuit missionary Francis Xavier for a time in 1551.

As a result of their wealth and trading contacts, the Ōuchi gained renown in the worlds of art and culture as well. They possessed countless items of cultural and artistic significance and beauty, from Japan and China, as well as from further abroad. Particularly famous was the invitation by Ōuchi Masahiro of the famous painter Sesshū to Yamaguchi in 1486. The prosperity of the Ōuchi was such that they attempted to bring the Emperor Go-Nara to move his capital from the war-torn Kyoto to their home city Yamaguchi in 1551, but the backlash against this plan by the Ōuchi's military establishment caused a rebellion which forced the daimyo Ōuchi Yoshitaka to commit suicide. The Ōuchi line proper ended here — for the next (and last) clan head Ōuchi Yoshinaga, installed by the leader of the rebellion Sue Harutaka, was actually the younger brother of the Ōuchi rival Ōtomo Sōrin. Yoshinaga committed suicide two years after the Battle of Miyajima of 1555 in which Sue Harutaka was defeated by Mōri Motonari, another former vassal of Yoshitaka.