The Sō clan of Tsushima han (Tsushima Island) were given the right to license ships sailing west beyond Tsushima; and this also encompassed the opportunity to profit from whatever fees the Sō might charge.
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-- NengoCalc 嘉吉一年六月二十四日 -->: Shogun Ashikaga Yoshinori is murdered at age 48 by Akamatsu Mitsusuke who was upset that Akamatsu Sadaura was made leader of the Akamatsu clan; and shortly thereafter, Yoshinori's 8-year-old son, Ashikaga Yoshikatsu, was proclaimed as the new Shogun.