Zhao Tuo
The kingdom of Âu Lạc laid south of Nanyue in the early years of Nanyue's existence, with Âu Lạc located primarily in the Red River delta area, and Nanyue encompassing Nanhai, Guilin, and Xiang Commanderies. During the time when Nanyue and Âu Lạc co-existed, Âu Lạc acknowledged Nanyue's suzerainty, especially because of their mutual anti-Han sentiment. Zhao Tuo built up and reinforced his army, fearing an attack by the Han. However, when relations between the Han and Nanyue improved, in 179 BC Zhao Tuo marched southward and successfully annexed Âu Lạc.