Hosokawa Katsumoto

Hosokawa Katsumoto (細川 勝元, 1430 – June 6, 1473) was one of the Kanrei, the deputies to the Shōgun, during Japan's Muromachi period.

His conflicts with his father-in-law, Yamana Sōzen, who resented the power Hosokawa had as Kanrei, were among those that ignited the Ōnin War in 1467.

When the Shōgun Ashikaga Yoshimasa had a son in 1464, Yamana took this as an opportunity to oppose Hosokawa further, supporting the child as heir to the Shogunate.

He even persuaded Yoshimasa to make him the general of the official Shogunal attacks on Yamana but failed to grant him any tangible support.

For much of that year, the two forces engaged in glaring contests and limited sorties, both desiring to rebuild and to act only defensively.