王世充
On July 1, 620, Li Shimin was sent to fight Wang Shichong. In the fall of 620, reports came in that Li Zhongwen (李仲文), who was then in charge at Taiyuan, was planning to rebel. Li Yuan sent Li Jiancheng to Pufan (蒲反, i.e., Hedong) to guard against Li Zhongwen, while summoning Li Zhongwen back to the capital. Li Zhongwen complied and was later executed.