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Reorganization of Sinju and the Defense System of ‘Sea Gate’ Danghangseong Fortress in Silla from the 6th to the First Half of the 7th Centuries

Jung, Duk-gi 1

1서울대학교

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ABSTRACT

The study examines the official defense system of Danghangseong Fortress in Silla from the 6th to the first half of the 7th centuries by analyzing the reorganization process of Sinju(新州)) and the environment of insular areas around Dangseong Fortress. The fortress was the starting point of the sea route connecting Silla and China, in other words, the ‘sea gate (海門)’ of Silla. From 555 to 558, Silla established Danghangseong Fortress as a diplomatic channel to China and its defense system was related to the reorganization of Sinju. The provincial capital of Sinju was Namcheon (南川) from 568 to 603. Until 648, the basic orientation of the Danghangseong Fortress defense system was to assume Baekje as a major enemy nation and to build a defense system between Namcheon and Gukwon-sogyeong (國原小京). The land defense system maintained its basic posture until 648, but was more reinforced when Baekje showed its willingness to attack Sinju and the southern part of Hansanju (漢山州) in 627 and 643. The sea defense system on the other hand can be approached by analyzing the environments of the islands around Dangseong Fortress. The islands were used as a base for the defense of the sea such as resistance and vigilance. The sea defense system was established by setting a ‘virtual double inland sea’ and then subdividing it into five sea sectors.

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