足利義教
King Sejong the Great sent a diplomatic mission to Japan ("Joseon Tongsinsa") in 1428. This embassy to court of Ashikaga Yoshinori was led by Pak Seo-saeng. Its purpose was to respond to a message sent to the Joseon court by the Japanese shogun. In 1430, he was appointed "Jiphyeonjeon bujehak" (집현전부제학, 集賢殿副提學). Soon after that, he became "Gongjo chamui" and "Byeongjo chamui" (참의, 參議), minister of Yukjo, the Six Ministries. In 1432, he was appointed the administrator of Andong.