신라 浿江鎭典의 정비와 漢州 西北境의 郡縣 설치

Abstract

The office of Paegangjin was established for managing the area of Paegangjin by Silla. Recently, the author has discovered the fact that Silla established the guarding frontier in the western costal area of Hwanghaedo and the southern area of Daedong river, with Balhae’s attack on Dengzhou in 732. In this article, I tried to clarify the location of Paegangjin and its jurisdiction, and the development process of the estuary of Yeseong river and inlands of Hwanghaedo which was not dealt with in the other day. The result of the research shows that Paegaing-jin can be regarded as Paegang-do/Paeseo-do which was the basis for the political power groups of Koryeo. That is, Paegang-do was corresponded to Seohae-do, ranging from the southern area of Pae river in Hwanghae-do towestern costal area, in reign of King Seongjon in Koryeo. Paeseo-do can fall under the western area of Pae river(Daedong river) under Seogyeong(Pyeongyang). And Gwannae-do referred to Hanju in Silla territory. In addition, Paegang-jin consisted of 14 Jins in and around Paegang-jin which was described as a military region in Sindangseo(新唐書) but it was reduced to 12 Jins when it was reorganized in the King Heonduk. The development of the northwestern border line in inland by Silla started when the border line was fixed by establishing the guarding frontier in the area of Pae river and costal area of Hwanghae-do, especially centering Janggu-jin. It is assumed that Silla organized the ruling system on the area of Pae river through securing the estuary of Yeseong river(748, establishing 14 Jin), the inland development around the area(762, building 6 Seong) and lastly, organizing Gun-Hyun in the southern area of Pae river(826, building Paegangseong). The securing the estuary of Yeseong river and the development of inland resulted in not only improving agriculture and commerce but also opening a newport for trading with Tang. On the other hand, it was a strategy to protect Silla itself from pirates and the influence of An Lushan Rebellion which emerged as a new threat in northwestern border in the middle of 8th century.