| Emperor Taizong's campaign against Tuyuhun | |||||||
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 Emperor Taizong's campaign against Tuyuhun in 634 AD | |||||||
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| Belligerents | |||||||
| Tang dynasty | Tuyuhun | ||||||
| Commanders and leaders | |||||||
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Tang Taizong Li Jing Duan Zhixuan Hou Junji Li Daozong Li Daliang | Murong Fuyun † | ||||||
Emperor Taizong of Tang (r. 626–649), the second emperor of the Tang dynasty faced challenges throughout his reign from Tang's western neighbor, the state of Tuyuhun, whose Busabuo Khan Murong Fuyun constantly challenged Tang authority in the border regions. In 634, Emperor Taizong launched a major attack, commanded by the major general Li Jing, against Tuyuhun, dealing Tuyuhun forces heavy defeats and causing Murong Fuyun's subordinates to assassinate him in 635. Tuyuhun, thus weakened, no longer remained a major power in the region, and while Tang, ironically, played the role of protector for Murong Fuyun's son, the Gandou Khan Murong Shun, and grandson, the Ledou Khan Murong Nuohebo, Tuyuhun was never able to recover, particularly with its southwestern neighbor, the Tibetan Empire, constantly attacking it. By 672, during the reign of Emperor Taizong's son Emperor Gaozong of Tang, Tang was forced to move Tuyuhun remnants into its own territory, ending Tuyuhun.