Su Wu
While visiting the Xiongnu, a deputy of Su Wu, Zhang Sheng (張勝), made contact with Chinese prisoners and conspired with them to revolt, kidnap Chanyu's mother, assassinate the Chanyu's half-Chinese advisor Wei Lü (衛律), and then head home. Zhang Sheng also tried to bribe the Chanyu's Prince of Gou (緱王) and Yu Chang (虞常). The plot was uncovered, and one of its leaders pointed to Zhang Sheng. A furious Chanyu executed the conspirators, and urged the members of the embassy to admit their guilt and switch to the side of the Xiongnu. When Su Wu refused to betray his country, he was sent to Lake Baikal, where he spend 19 years before he could return to China.