By the end of the first millennium CE, a vast portion of Central Eurasia was con-trolled by nomadic powers: the Sinicized Khitans (907–1125), who were later replaced by the Jurchens (1115–1234) and the Tanguts (1038–1227) in North and Northwest China; and the Turko-Islamic dynasties such as the Qarakhanids (840–1212), the Ghaznavids (977–1163) and the Saljuqs (1037–1194, and 1077–…