伏允
In 608, the official Pei Ju persuaded Tiele to attack Tuyuhun, and after Tiele defeated Tuyuhun, Tuyuhun's Bujiabo Khan Murong Fuyun offered to surrender to Sui. Emperor Yang sent his cousin Yang Xiong (楊雄) the Prince of Ande and Yuwen to rendezvous with Murong Fuyun to accept his surrender, but once Yuwen arrived at Linqiang (臨羌, in modern Xining, Qinghai), Murong Fuyun, fearful of the strength of Yuwen's force, changed his mind and fled west, and Yuwen attacked Tuyuhun's trailing people instead, capturing thousands of Tuyuhun's people. Emperor Yang thus established four commanderies over the former Tuyuhun territory.