In 1636,
King Injo sent a mission to Japan led by Im Gwang. This diplomatic mission functioned to the advantage of both the Japanese and the Koreans as a channel for developing a political foundation for trade. This delegation was explicitly identified by the Joseon court as a "Communication Envoy" (
tongsinsa). The mission was understood to signify that relations were "normalized." According to the
Japanese calendar, the mission reached Japan in the 12th month of the 13th year of ''
Kan'ei (1635). The grand procession of the shogun and his entourage, which included the Joseon ambassador and his retinue, was recorded to have occurred in the 4th month of the 14th year of Kan'ei'', as reckoned according to the Japanese calendar. ==Recognition in the West==