刘黑闼
In spring 622, Li Shimin defeated Liu Heita, forcing him to flee to the Eastern Turks, but Liu Heita soon returned with Turkish reinforcements and killed Emperor Gaozu's nephew Li Daoxuan () the Prince of Huaiyang in battle, again seizing former Xia territory, although by this point Li Shimin and Li Yuanji had also defeated Xu Yuanlang and reduced his territory to a few cities.