In one ancient myth, Yu the Great encountered a white nine-tailed fox, which he interpreted as an auspicious sign that he would marry Nüjiao.[5] In Han iconography, the nine-tailed fox is sometimes depicted at Mount Kunlun and along with Xi Wangmu in her role as the goddess of immortality.[5] According to the first-century Baihutong (Debates in the White Tiger Hall), the fox's nine tails symbolize abundant progeny.[5]