Pei Ju
Pei Ju had become apprehensive that khagan was becoming strong and difficult to control and had therefore suggested that Emperor Yang offer to marry a princess to the khan's brother Ashina Chiji (阿史那叱吉). Chiji shad, in fear, declined. This already brought resentment from the khagan, when Pei tricked the Shibi Khan's strategist Shishuhu (史蜀胡) into meeting him at Mayi (present-day Shuozhou, Shanxi) and then killed him, claiming that Shishuhu was planning to rebel against the khagan. Shibi Khahan, knowing that the accusation was false, became resolved to rebel against Sui.