Goryeo missions to Japan represent a crucial aspect of the international relations of mutual Goryeo-Japanese contacts and communication, especially during the years in which there were no official contacts between the leaders of Goryeo and the leaders of Japan.[1]
The unique nature of these bilateral diplomatic exchanges evolved from a conceptual framework developed by the Chinese. Gradually, the theoretical model would be modified. The changing model mirrors the evolution of a unique relationship between two neighboring states.[1]
The establishment of Goryeo in 918 was accompanied by break in bilateral relations with Japan. Taejo of Goryeo was focused on consolidation within the confines of his kingdom.[2] Goryeo twice sent envoys to Japan, hoping to establish relations, but the venture was rebuffed by the Japanese.[1]
In 1367, Kim Yong and Kim Il traveled as representative of Goryeo to the court of the Ashikaga shogunate. On their return in 1368, Japanese monks Bonto and Bonryu from Tenryu-ji went with them. This was the first diplomatic exchange between Goryeo and Japan since the early 10th century.[2]
Na Heung-yu represented Goryeo interests during his visit to Japan in 1375.[2]
Goryeo envoy Chŏng Mong-ju traveled to Japan in 1377;[3] the consequences of his efforts unfolded slowly.
The Joseon foreign policy would evolve from foundations established in the course Goryeo's foreign relations history.
A number of items were influenced by Goryeo such as architecture. A wooden gate style called Kōrai-mon (高麗門 "Goryeo") gate developed in Japanese castles, as well as other building styles.