Ashikaga Yoshimasa
During the Ashikaga Shogunate, due to tensions between the shogunate retainers, Japan goes to war again. In 1460, when shogun Ashikaga Yoshimasa abdicated his position to his younger brother Ashikaga Yoshimi, Hino Tomiko (Yoshimasa's wife) was strongly against this decision. Tomiko sought political and military support to rule as regent until the birth of her son, she secured the support of Yamana Sōzen and other leaders of powerful samurai clans. Then she went to war against Yoshimasa and his supporters, especially the Hosokawa clan. This dispute for succession started the Ōnin War (1467-1477) and led to the beginning of the Sengoku period.