1443년(세종 25) 계해약조 체결의 의미

Abstract

The purpose of this study is to consider the conclusion of Gyehaeyakjo in a new theoretical standpoint. Although a new treaty between Joseon dynasty and the lord of Tsushimawas concluded in 1443, most of the terms had been already implemented. It can be considered that the meaning of the treaty is in a situation at which it was signed rather than the contents of the treaty. Around that time, Joseon went through the external political chaos from both inside and outside the nation. The united north barbarians near Pajeo River kept threatening territory of Joseon with permission of Ming emperor. Joseon needed to be alert to Japanese intensifying civil war at the same time. Meanwhile, as the health condition of Sejong was getting worse, proxy administration by a prince regent was continually discussed. The courtier had taken issue with Sejong over the policy since 1436 ; however, judging that it could not be delayed any longer, Sejong pushed ahead with the policy in 1442. In these circumstance, the 3rd Tongsinsa left for Japan and Gyehaeyakjo was concluded. Until then, most of the policies between Joseon and Japan had been handled at the level of Yejo or, if necessary, Kyongchagwan or Chechalsa were dispatched. Only Gyehaeyakjo was signed at the level of Tongsinsa. This is in close connection with proxy administration by a prince regent. During the discussion on the proxy administration, Sejong cited King Tejong's participation in important affaires of the country as a justification. Tejong as an ex-king tried to stabilize the external relationship before Sejong's direct rule began. It is understandable the conquest of Tsushima conducted in 1419 was a kind of that action. This achievement enabled Sejong to implement various policies based on the initiative in relations with Japan even after the direct rule. Sejong also wanted to form a same system by the proxy administration. After establishing the system, Sejong completed 4gun 6jin in the north to stabilize external relations, and signed Gyehaeyakjo in the relations with Japan. Sejong hoped that his son would lead the external relations like himself through this achievement.