Murong Fuyun (; 597–635), regnal name Busabo Khan (), was a ruler of the Xianbei-led dynastic state of Tuyuhun. He first became ruler when his brother Murong Shifu was assassinated in 597, and became one of the longest-ruling monarchs of Tuyuhun. His reign was characterized by numerous major conflicts with the Sui dynasty and Tang dynasty dynasties. In 635, during a Tang invasion, he was assassinated due to the people's resentment of his hostile attitude toward the Emperor Taizong of Tang that led to the invasion.
For reasons lost to history, there was a major disturbance in Tuyuhun in 597, and Murong Shifu was assassinated. The people supported Murong Fuyun as khan. He sent emissaries to Sui to explain the situation and to ask for permission to, pursuant to Tuyuhun customs, marry Princess Guanghua as well. Emperor Wen agreed. (He and Princess Guanghua thereafter had at least one son, Murong Shun.)
In 608, Pei persuaded the Dingling tribes to attack Tuyuhun, and Tiele forces defeated Tuyuhun forces. Murong Fuyun took his people east, entering Sui's Xiping Commandery (西平, roughly modern Xining, Qinghai) to ask for refuge and aid against the Tiele. Emperor Yang sent his cousin Yang Xiong (楊雄) the Prince of Ande and Yuwen Shu the Duke of Xu to escort Murong Fuyun. As Yuwen's forces approached, however, Murong Fuyun became apprehensive of the strength of his forces and decided to flee. Yuwen attacked him, and was said to have killed 3,000 Tuyuhun soldiers, and captured some 200 Tuyuhun nobles and 4,000 households. Murong Fuyun fled southwest into the mountains. Sui took over former Tuyuhun lands and divided it into four commanderies, settling minor criminals in those lands.
By 609, however, Murong Fuyun appeared to have exited the mountains and taken the land back, and Emperor Yang, this time commanding the army himself, again attacked Tuyuhun. Emperor Yang's forces, while suffering some minor setbacks, were again able to send Murong Fuyun fleeing, reaffirming Sui's control over the Tuyuhun lands. With Murong Shun in his hands, he created Murong Shun as khan and had him, assisted by Ni Luozhou (尼洛周) the Prince of Dabao, trying to head toward the Tuyuhun people to take over control. On the way, however, Ni was assassinated, and Murong Shun retreated back to Sui. In 613, Pei again persuaded the tribes submitting to Western Tujue's Heshana Khan to attack Tuyuhun.
Little is known about Tuyuhun's status under Murong Fuyun the next several years, but at the time, Sui itself was collapsing, engulfed in agrarian rebellions throughout its territory.
Starting 622, Murong Fuyun, apparently under the advice of his strategist the Prince of Tianzhu, began frequent pillaging attacks on Tang's prefectures bordering Tuyuhun, making several attacks per year. The attacks continued throughout the rest of Emperor Gaozu's reign, up to 626 (when he was forced to abdicate in favor of his son Li Shimin (as Emperor Taizong)).
In fall 634, Emperor Taizong sent the generals Duan Zhixuan (段志玄) and Fan Xing (樊興) to attack Tuyuhun with Tang forces, supplemented by soldiers from the Qibi (契苾) and Dangxiang tribes. When Duan began the attack, however, after minor successes, Tuyuhun forces simply began to elude him and refuse to engage him. Apparently immediately after he withdrew, Tuyuhun forces again attacked Liang Prefecture (涼州, roughly modern Wuwei, Gansu).
Around the new year 635, Emperor Taizong sent Li Jing to attack Tuyuhun again. In summer 635, Tang forces began engaging Tuyuhun forces, and after some minor victories by Li Jing's subordinate Li Daozong, Murong Fuyun, apparently following the same strategies he used against Duan, burned the grasses and fled. Most of Li Jing's subordinates believed that it was dangerous to venture further without adequate grazing supplies and advised withdrawal, but Hou Junji opposed the idea, pointing out that this was the opportunity to destroy Tuyuhun. Li Jing agreed, and divided his forces into two branches—with Li Jing himself and Xue Wanjun (薛萬均) and Li Daliang heading northwest, and Hou and Li Daozong heading southwest. Both prongs continued to be successful. Eventually, Li Jing received news of Murong Fuyun's location and surprised Murong Fuyun, defeating his remaining forces. Murong Fuyun himself managed to flee, but the nobles, led by Murong Shun, killed the Prince of Tianzhu and surrendered. Murong Fuyun, in flight, was killed by his subordinates.The Zizhi Tongjian indicated that Murong Fuyun was killed by his subordinates, but both the Old Book of Tang and the New Book of Tang indicated that he committed suicide. Emperor Taizong created Murong Shun the dual titles of Prince of Xiping and Zhugulüwugandou Khan (or Gandou Khan in short), to succeed Murong Fuyun.
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