Ashikaga Yoshinori
King Sejong dispatched a diplomatic mission to Japan in 1439. This embassy to court of Ashikaga Yoshinori was led by Go Deuk-jong. Its purpose was to foster and maintain neighborly relations ("Gyorin" diplomacy); and assistance from the shogun was sought in suppressing the pirate raids from those known in Korean as "waegu" or in Japanese as the "wakō".