Kitan and Jurchen
Free of Uyghur restraint, the Mongolic Kitan expanded in all directions in the latter half of the 9th century and the early years of the 10th century. By 925 the Kitan ruled eastern Mongolia, most of Manchuria, and much of China north of the Huang He. By the middle of the 10th century, Kitan chieftains had established themselves as emperors of northern China; their rule was known as the Liao Dynasty (916–1125).
The period of the 11th and 12th centuries was one of consolidation, preceding the most momentous era in Mongol history, the era of Genghis Khan. During those centuries, the vast region of deserts, mountains, and grazing land was inhabited by people resembling each other in racial, cultural, and linguistic characteristics; ethnologically they were essentially Mongol. The similarities among the Mongols, Türk, Tangut, and Tatars who inhabited this region cause considerable ethnic and historical confusion. Generally, the Mongols and the closely related Tatars inhabited the northern and the eastern areas; the Türk (who already had begun to spread over western Asia and southeastern Europe) were in the west and the southwest; the Tangut, who were more closely related to the Tibetans than were the other nomads and who were not a Turkic people, were in eastern Xinjiang, Gansu, and western Inner Mongolia. The Liao state was homogeneous, and the Kitan had begun to lose their nomadic characteristics. The Kitan built cities and exerted dominion over their agricultural subjects as a means of consolidating their empire. To the west and the northwest of Liao were many other Mongol tribes, linked together in various tenuous alliances and groupings, but with little national cohesiveness. In Gansu and eastern Xinjiang, the Tangut—who had taken advantage of the Tang decline—had formed a state, Western Xia or Xixia (1038–1227), nominally under Chinese suzerainty. Xinjiang was dominated by the Uyghurs, who were loosely allied with the Chinese.
The people of Mongolia at this time were predominantly spirit worshipers, with shamans providing spiritual and religious guidance to the people and tribal leaders. There had been infusion of Buddhism.
A Tungusic people, the Jurchen, ancestors of the Manchu, formed an alliance with the Song and reduced the Kitan Empire to vassal status in a seven-year war (1115–1122). The Jurchen leader proclaimed himself the founder of a new era, the Jin Dynasty (1115–1234). Scarcely pausing in their conquests, the Tungusic Jurchen subdued neighboring Koryo (Korea) in 1226 and invaded the territory of their former allies, the Song, to precipitate a series of wars with China that continued through the remainder of the century. Meanwhile, the defeated Kitan Liao ruler had fled with the small remnant of his army to the Tarim Basin, where he allied himself with the Uyghurs and established the Karakitai state (known also as the Western Liao Dynasty, 1124–1234), which soon controlled both sides of the Pamir Mountains. The Jurchen turned their attention to the Mongols who, in 1139 and in 1147, warded them off.
Read more about this topic: Mongols Before Genghis Khan