Yoshimasa’s indecision over his successor — first naming his brother, then having a son with his wife Hino Tomiko — split the great daimyo into two camps under Hosokawa Katsumoto and Yamana Sozen. The resulting Onin War (1467-1477) burned Kyoto for 11 years, collapsed shogunal authority, and ushered in the century-long Warring States period. Even as the capital burned, Yoshimasa pursued the arts.