Study On The History Of Political Relations Of Northeastern Asia From The Fourth To The Seventh Century

During the dynasties of Han and Jin, Northeastern Asia was almost unified, but since the fall of the west Jin Dynasty, history has changed greatly. It is from the fourth to the seventh century that history changed, and in this period rose together many political powers such as Koguryo (高句丽), Paekche (百济), Silla (新罗), Wo (倭, early Japan),and so on. They not only often fought each other, but also opposed Sui Dynasty and Tang Dynasty unified them, especially Koguryo, which caused the wars Sui Dynasty or Tang Dynasty attacked Northeastern Asia many times. Although Tang Dynasty destroyed Paekche and Koguryo, but for the rise of Tubo(吐蕃), Tang Dynasty finally had to accept the triangular balance of the three countries: Tang, Silla, Wo by the imperial tributary system in Northeastern Asia.Using historical and archaeological materials from China, Japan and Korea, the dissertation systematically studies the political relation history among the state powers and tribes from the fourth to the seventh century in Northeastern Asia which is regarded as a whole. Such as mutual political relations among Koguryo, Paekche, Silla, Wo, Mohe, Khitan (契丹), Xi (奚), Tujue (突厥),etc and the succession of dynasties that ruled China in the period. The dissertation puts forward some new views on the rise and fall of Koguryo, Paekche and Silla, gives some new trains of thought to comprehend the formation of the triangular balance and ancient relation structure of the three countries: China, Japan, Korea in Northeastern Asia.