8세기 초 발해․당의 긴장관계에 대한 신라의 외교전략-나당간의 국서를 중심으로-

Abstract

Silla’s diplomatic tatics by using tention between Balhae and Tang in the early 8th Century Kim Jong-bok 〔Abstract〕 Silla united with the Tang Dynasty and destroyed Baekje and Koguryo. The condition of Silla-Tang alliance was ‘Silla occupying Baekje territory, south of Pyongyang’. However, Tang broke the promise and it brought about the Silla–Tang War. The northwestern border of Silla was Imjingang River area although Andong Protectorate of Tang retreated to Liaodong after the war. Silla sought to improve the relationship with Tang through a cultural approach of accepting the manners and systems of Tang during a cooling-off period between Silla and Tang. In the winter of 694 which was after Ju delivered Kim In-moon’s coffin to Silla and Silla adopted Zhou's calendar, Silla built two fortresses in Songak and Woojam across the Imjingang River. Also, in October of 713, Tang Emperor Xuanzong newly appointed King Seongdeok of Silla to contain Balhae, and this led Silla to build Gaesung fortress near the Yesunggang River across the Imjingang River. Likewise, the advance of Silla towards the northwest area could not be achieved without the improvement of the relationship with Tang. King Seongdeok took an active Tang-friendly policy of dispatching envoys to Tang 40 times. As a result, Tang treated Silla preferentially compared to other neighboring countries, but did not allow Silla to occupy ‘Baekje territory, south of Pyongyang’. Silla accomplished its desired result using the strained relations between Balhae and Tang. In the early 8th century, in the strained relations between Balhae and Tang, Silla realized that Tang intended to contain Balhae using Silla. Silla requested Tang to allow to station troops around the Paegang River to meet the intention of Tang. And as Tang allowed that, Silla stretched the meaning of it as acknowledging the sovereignty over the south of the Paegang River territory. Eventually, Tang was forced to accept it. (Assistant Professor at Andong University / kjb6786@anu.ac.kr)