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    Source: The Library of Congress Country Studies


    Figure 2. Korea During the Three Kingsons Period, Fifth to Sixth Centuries, A.D.

    The territory south of the Han River is relatively distant from the Asian continent; hence, the people living there were initially able to develop independently, without much involvement with events on the continent. The early settlers of this region gradually organized themselves into some seventy clan states that were in turn grouped into three tribal confederations known as Chinhan, Mahan, and Pyonhan. Chinhan was situated in the middle part of the peninsula, Mahan in the southwest, and Pyonhan in the southeast. Their economies were predominantly agricultural, and their level of development was such that they built reservoirs and irrigation facilities. These tribal states began to be affected by what was happening in the region north of the Han River around the first century B.C.

    About the middle of the third century A.D., the Chinese threat began to serve as a unifying political force among the loose confederations of tribes in the southern part of the peninsula. Adopting the Chinese political system as a model, the tribes eventually merged into two kingdoms, thereby increasing their chances of survival against Chinese expansionism. The two kingdoms eventually came to play an important role in Korean history.

    Geographic features of the southern parts of the land, in particular the configuration of mountain ranges, caused two kingdoms to emerge rather than one. In the central part of Korea, the main mountain range, the T'aebaek Range, runs north to south along the edge of the Sea of Japan, which lies off the east coast of the peninsula. Approximately three-fourths of the way down the peninsula, however, at roughly the thirty-seventh parallel, the mountain range veers southwest, dividing the peninsula almost in the middle. This extension, the Sobaek Range, proved politically significant; the tribes west of it were not shielded by any natural barriers against the Chinese-occupied portion of the peninsula, whereas those to the southeast were protected. Moreover, the presence of the mountains prevented the tribes in the two regions from establishing close contacts.

    The tribal states in the southwest were the first to unite, calling their centralized kingdom Paekche. This process occurred in the mid-third century A.D., after the Chinese army of the Wei Dynasty (A.D. 220-65), which controlled Lolang, threatened the tribes in A.D. 245. The Silla Kingdom evolved in the southeast. Silla historians traced the kingdom's origin to 57 B.C., but contemporary historians regard King Naemul (A.D. 356-402) as having been the earliest ruler. Some of the tribal states in the area of the lower Naktong River, along the south central coast of the peninsula, did not join either of these kingdoms. Under the name Kaya, they formed a league of walled city-states that conducted extensive coastal trade and also maintained close ties with the tribal states in western Japan. Sandwiched between the more powerful Silla and Paekche, Kaya eventually was absorbed by its neighbors during the sixth century (see fig. 2).

    The northern kingdom of Koguryo emerged from among the indigenous people along the banks of the Yalu River. The Han Chinese seized the area in 108 B.C., but from the beginning Chinese rulers confronted many uprisings against their rule. Starting from a point along the Hun River (a tributary of the Yalu), the rebels expanded their activities to the north, south, and southeast, increasingly menacing Chinese authority. By A.D. 53 Koguryo had coalesced into an independent centralized kingdom; the subsequent fall of the Han Dynasty and ensuing political divisions in China enabled Koguryo to consolidate and extend its power. Despite repeated attacks by Chinese and other opposition forces, by 391 the kingdom's rulers had achieved undisputed control of all of Manchuria east of the Liao River as well as of the northern and central regions of the Korean Peninsula. Koguryo's best-known ruler, King Kwanggaet'o--whose name literally means "broad expander of territory"--lived to be only thirty-nine years of age, but reigned twenty-one years, from 391 to 412. During that period, Kwanggaet'o conquered 65 walled cities and 1,400 villages, in addition to aiding Silla when it was attacked by the Japanese. His accomplishments are recorded on a monument erected in 414 in southern Manchuria. Koguryo moved its capital to P'yongyang in 427 and ruled the territory north of the Han River. But Koguryo's expansion caused it to come into conflict with the Sui Dynasty of China (581-617) in the west and Silla, which was beginning to expand northward, in the south.

    Although Koguryo had been strong enough to repulse the forces of the Sui Dynasty, combined attacks by Silla and the Tang Dynasty of China (618-907) proved too formidable. Koguryo's ally in the southwest, Paekche, fell before Tang and Silla in 660; the victorious allies continued their assault on Koguryo for the next eight years and eventually vanquished the weary kingdom, which had been suffering from a series of famines and internal strife.

    Silla thus unified Korea in 668, but the kingdom's reliance on China's Tang Dynasty had its price. Eventually Silla had to forcibly resist the imposition of Chinese rule over the entire peninsula, which Silla's rulers did, but their strength did not extend beyond the Taedong River. Much of the former Koguryo territory was given up to the Chinese and to other tribal states. It remained for later dynasties to push the border northward to the Yalu and Tumen rivers.

    Data as of June 1990

    NOTE: The information regarding Korea, South on this page is re-published from The Library of Congress Country Studies. No claims are made regarding the accuracy of Korea, South THE THREE KINGDOMS PERIOD information contained here. All suggestions for corrections of any errors about Korea, South THE THREE KINGDOMS PERIOD should be addressed to the Library of Congress.

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    Revised 04-Jul-02
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