高句麗의 東海 및 東海岸路 支配를 둘러싼 諸問題

Abstract

Dongokjeo and Ye forces were occupied by Goguryeo that was in its continuous growth stage. As these forces that were located in the coastal area of the East Sea came under the control of Goguryeo, Goguryeo began receiving tributes such as salt, marine products and grains. And at the same time it started utilizing the coastal route of the East Sea in earnest. In addition, it set about establishing its control over the East Sea using the Goseong Port. The movement of Goguryeo to expand its authority over the East Sea and its coastal route began naturally affecting Silla. The dispute over the control of the land(所爭之地) between Siljikgokguk located in the Samcheok in Gangwon Province and Eumjibbeolguk based on Seobuk in Gyeongju occurred at the point of the contact where the forces of Siljikgokguk that went down along the coastal route of the East Sea met Eumjibbeolguk that moved upward following the traffic route. Goguryeo that expanded its control over the East Sea and its coastal region was able to initiate exchanging with Japan and in the process realized the strategic importance of Ulleung Island in which Usanguk was located. The traces of stone graves of Goguryeo that were found in the piled-stone chamber tombs with the stereobate(基壇式 積石石室墳) in the island were a corroborative evidence that strongly backs the theory. On the other hand, the dominance of Usanguk by Silla was mainly motivated by the purpose of gaining the control of the East Sea and controlling Japanese raiders. As for the port from which YiSaBu left for the conquest of Usanguk, the Gangreung theory has also attracted attention due to the recent discovery of the earthen fortifications in Gangmun-dong, Gangreung.