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'Emperor Taizong of Tang' (r. 626-649), the second emperor of Chinese dynasty Tang Dynasty, early in his reign, had allied with 'Xueyantuo', a vassal of the powerful Eastern Tujue (Göktürk) Khanate, against Eastern Tujue, which Tang successfully defeated in 630. Upon Eastern Tujue's defeat, Xueyantuo's Zhenzhu Khan Yi'nan took over Eastern Tujue's former territory, and while he was formally submissive to Tang, he was expanding his own strength, and eventually, when Emperor Taizong tried to restore Eastern Tujue in 639 under the Qilibi Khan Li Simo to counteract against Xueyantuo, Xueyantuo engaged in multiple battles with the newly restored Eastern Tujue, and while the major Tang general Li Shiji temporarily protected Eastern Tujue against Xueyantuo by defeating Xueyantuo forces in 641, in 644, with Emperor Taizong occupied with a campaign against Goguryeo, Xueyantuo forces defeated Eastern Tujue, forcing Li Simo to flee back to Tang. Subsequently, Goguryeo sought aid from Xueyantuo, but Yi'nan avoided direct conflict with Tang. After Yi'nan's death in 645, however, his son, the Duomi Khan Bazhuo began heavily battling Tang forces. In 646, Tang forces counterattacked, and after they defeated Bazhuo, Xueyantuo's vassal Huige rose and killed him. His cousin, the Yitewushi Khan Duomozhi, surrendered to Tang forces, ending Xueyantuo.

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See also

See also

★ Emperor Taizong's campaign against Eastern Tujue

★ Emperor Taizong's campaign against Goguryeo