高句麗와 北朝의 경계-고구려의 遼西 동부지역 확보와 그 시기-

Abstract

Koguryeo advanced into the west of the Liao River(遼西) in 525-528. The military action was taken suddenly under favor of the collapse of dominance on the west of the Liao River by the Northern Wei Dynasty(北魏). Therefore, the expansion to the west of the Liao River occurred all of a sudden and Koguryeo seemed to discard its foreign policies focusing on the Northern Dynasties of China that it had maintained. However, the expansion of Koguryeo into the west of the Liao River was taken by figuring out not only the domestic affairs of the Northern Wei Dynasty but also the international situations around the dynasties. This was because it was able to expect the future relationship with the Northern Wei Dynasty and encountering with the northern powers including the Turkic Khaganate(突厥). It cannot be regarded that Koguryeo advanced into the west of the Liao River without considering these problems. Koguryeo would have considered these as it refrained from expanding into the west of the downstream of the Daling River(大凌河), although it had an opportunity to occupy the west of the Liao River and Yingzhou營( 州) area. From the expansion, Koguryeo occupied the eastern area of the west of the Liao River, sharing the west of the Liao River with the Northern Dynasties of China located in Chao Yang(朝陽). In particular, the area dominated by Koguryeo had a geographical attribute to be separated from the west area with the natural boundary of the downstream of the Daling River and Yimuryo Mountain(醫巫閭山) from the North. The Han Dynasty(漢) made Yodonggun(遼東郡) by combining this area and the east of the Liao River by considering the geographical condition. It also had the main line(幹線) from the ancient times connecting the west and the east of the Liao River. It is told that Koguryeo was well aware of such a geographical condition and its strategical value through the experiences from the previous generations . the battle with HouYan(後燕) and the battle with Qian Yan(前燕). Given the facts, the meaning of expansion of the east of the west of the Liao River in the history of Koguryeo is nothing more than it secured hundreds of Li(0.24 mile) of area in the west of the Liao River. By sharing the west of the Liao River, Koguryeo was able to establish more sound foreign policies to secure the safety of the east of the Liao River. The fact that Koguryeo was able to negotiate with the central forces in the nomadic community in the North through the secured area supports the assumption.