Li Xiaogong
Also in 621, Emperor Gaozu's nephew Li Xiaogong the Prince of Zhao Commandery attacked Xiao Xian's Liang state in southern China, putting the Liang capital Jiangling under siege. Xiao, not realizing that relief forces were approaching, surrendered, and most of his state was annexed by Tang, while some of Xiao's army submitted to Lin Shihong. Around the same time, Li Fuwei defeated Li Zitong, forcing Li Zitong's surrender, and Li Zitong's Wu state was also annexed by Tang.