Significant events which shaped the period during which Yoshikatsu was shogun: * July 12, 1441 (Kakitsu 1, 24th day of the 6th month): Shogun Yoshinori is murdered at the age of 48 by Akamatsu Mitsusuke; and shortly thereafter, it is determined that his 8-year-old son, Yoshikatsu, will become the new Shogun. * 1442 (Kakitsu 2): Yoshikatsu is confirmed as shogun. * August 16, 1443 (Kakitsu 3, 21 day of the 7th month): Shogun Yoshikatsu died at the age of 10. Fond of horse riding, he was fatally injured in a fall from a horse. He had been shogun for only three years. His 8-year-old brother, Yoshinari, was then named shogun. Several years after he became shogun, Yoshinari changed his name to Yoshimasa, and he is better known by that name.