Yoshimasa was the son of the sixth shōgun
Ashikaga Yoshinori. His childhood name was Miharu (三春). His
official wife was
Hino Tomiko. On August 16, 1443, the 10-year-old
shōgun Yoshikatsu died of injuries sustained in a fall from a horse. He had been shōgun for only three years. Immediately, the
bakufu elevated Yoshinari, the young shōgun's even younger brother, to be the new
shōgun. Several years after becoming shōgun, Yoshinari changed his name to Yoshimasa, by which he is better known. Also in 1443, supporters of the
Southern Court orchestrated the theft of the Imperial regalia. Following this event, in 1445,
Hosokawa Katsumoto assumed the role of Kyoto
kanrei. The year 1446 marked a significant development as the Southern army faced a crushing defeat, leading to the subsequent suppression of remnants from the Southern dynasty in 1448. In 1449, Yoshimasa was appointed shōgun, and
Ashikaga Shigeuji became
Kantō kubō. While the period between 1450 and 1455 experienced disturbances in
Kamakura between
Kantō kubō Ashikaga Shigeuji and his Uesugi
Kanrei. . Part of the
Shimazu-ke Monjo collection (島津家文書).
National Treasure.|left|180x180pxThe 1450s saw several events unfolded which set the stage for the impending
civil war. In 1454, dissension arose in the Hatakeyama succession. Discord in Kamakura between the
Kubō and his Uesugi
Kanrei line, resulting in the establishment of "Koga
Kubō" (1455–1583) in 1455. Following this in 1457, the "Horikoshi
Kubō" (1457–1491) was established. The Imperial regalia, which had been stolen, was restored to the
Northern Court in 1458. In 1460, Hatakeyama rebelled against Yoshimasa. The latter adopted
Ashikaga Yoshimi in 1464. The year 1466 saw the birth of
Yoshihisa, and Emperor
Go-Tsuchimikado ascended the throne during the same year. Additionally, dissension over the
Shiba succession occurred in 1466. ==Ōnin War==