THE PREDYNASTIC KHITAN 47
flocks of sheep and horses and hunting in its own territories. Only in case of
warfare did their chieftains meet and elect a temporary leader.'
The Khitans' political fate was largely determined by their far more power-
ful neighbors and by the ever-changing balance of power between the succes-
sive regimes ruling northern China, on the one hand, and belligerent tribal
neighbors to the north, northeast, and northwest, on the other. When China
was strong, as under the T'o-pa Wei in the fifth century, the Khitan were
drawn into its political orbit. When China was relatively weak, they became
vassals of other nomadic peoples such as the T'u-chueh, the Turkic people
who in the sixth century succeeded the Jou-jan as the lords of northern Asia.
Some Khitan tribes in the east even paid allegiance to the state of Kogury6
centered in southeastern Manchuria and northern Korea.
Nevertheless, when temporarily united, the Khitan could become
a
consid-
erable military threat, as was proved in 605 when they staged a large-scale
invasion of Sui territory in Hopei and northern Shansi. This provoked a
major Sui punitive expedition, which inflicted grievous losses on the Khitan
nation, leaving them temporarily much reduced in numbers.
6
In the 620s and 630s the situation changed radically with the rise of the
T'ang, not only as a powerful Chinese dynasty, but also as a power that
claimed hegemony in the northern steppe following their defeat of the T'u-
chueh in 630. During these years the Khitan again gradually drifted into
China's political orbit. One of their chieftains visited Ch'ang-an in 623, and
another came to offer formal submission in 628 after calling a conference of
tribal leaders. During T'ai-tsung's campaign against Koguryo in 645, some
Khitan tribes fought on the side of the T'ang, and in 647 a confederation of
eight tribes under the chieftain, K'u-k'o, of the Ta-ho clan submitted to
T'ang suzerainty. ?
It is not clear whether K'u-k'o was a temporary leader elected during a
period of crisis or a new type of leader elected for life or whether he had
become leader by hereditary succession. The leader who had led the tribute
mission in 628 had been a member of the same Ta-ho clan. It may well be
that by the 640s the Khitan confederation had become more stable and
cohesive under the influence of their erstwhile overlords, the politically more
sophisticated T'u-chiieh. The T'ang court decided to control them indirectly
5 See Wei Cheng et al., eds., Sui shu (Peking, 1973), 84, pp. 1881-2.
6 See Ssu-ma Kuang et al., comps., Tzu chih t'ung Men (Peking, 1956), 180, pp. 5621-2.
7 On the Khitan during the T'ang, see Liu Hsu et al., eds., Cbiu
T'ang
shu (Peking, 1975), 199B, pp.
5349-54 (hereafter cited at CTS); Ou-yang Hsiu and Sung Ch'i, comps., Hsin
T'ang
shu (Peking,
1975),
219, pp. 6167—73 (hereafter cited as HTS); Wang P'u,
T'ang
hut yao
(Shanghai, 1935; reprinted
Peking, 1955, 1957), 96, pp. 1717-19 (hereafter cited as THY). See also Denis C. Twitchett and John
K. Fairbank, eds., Sui and
T'ang
China, 589—906, pt. I, vol. 3 of The Cambridge history of China
(Cambridge, 1979), pp. 314—16, 438—40.
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