窦建德
Nevertheless, he created Yang Zhengdao, a posthumous son of Yang Jian, as puppet King of Sui (隋國王). Starting to plan a major assault as advised by Liang Shidu, he became allied to Wang Shichong and Dou Jiande. As part of the plan, he requested Dou to cross the Taihang Mountains and meet him at Jin (晉州, roughly modern Linfen, Shanxi) and Jiang (絳州, roughly modern Yuncheng, Shanxi) Prefectures.