Empress Lü Zhi
After the death of Liu Bang in 195 BC, the government was put in the hands of his wife, Empress Lü Zhi, who served as Empress Dowager over their son Emperor Hui of Han and then Emperor Hui's sons Liu Gong and Liu Hong. Enraged, Empress Lü sent men to Zhao Tuo's hometown of Zhending (modern Zhengding County in Hebei Province) who killed much of Zhao's extended family and desecrated the ancestral graveyard there. Zhao Tuo believed that Wu Chen, the Prince of Changsha, had made false accusations against him to get Empress Dowager Lü to block the trade between the states and to prepare to conquer the Nanyue to merge into his principality of Changsha. In revenge, he then declared himself the emperor of Nanyue and attacked the principality of Changsha and captured some neighboring towns under Han domain. Lü sent general Zhou Zao to punish Zhao Tuo. However, in the hot and humid climate of the south, an epidemic broke out quickly amongst the soldiers, and the weakened army was unable to cross the mountains, forcing them to withdraw which ended in Nanyue victory, but the military conflict did not stop until the Empress died. Zhao Tuo then annexed the neighboring state of Minyue in the east as subject kingdom. The kingdom of Yelang and Tongshi (通什) also submitted to Nanyue rule.