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Emperor Taizong's Campaign Against Xueyantuo

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 (Goktvrk) 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. When Emperor Taizong tried to restore Eastern Tujue in 639 under the Qilibi Khan Ashina Simo (also known as Li Simo) to counteract the rise of Xueyantuo power, Xueyantuo engaged in multiple battles with the newly restored Eastern Tujue, in order to prevent this return. The major Tang general Li Shiji temporarily came to protect Eastern Tujue against Xueyantuo and defeated the Xueyantuo forces in 641. But in 644, with Emperor Taizong occupied with a campaign against Goguryeo, Xueyantuo forces launched a new campaign, defeated Eastern Tujue, forcing Ashina Simo to flee back to Tang. Subsequently, Goguryeo sought aid from Xueyantuo, but Yi'nan avoided further conflict, wanting to avoid direct battle 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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