《后汉书·列传·东夷列传》
自从武帝灭掉朝鲜，倭人派使者和翻译和汉来往的有三十个左右的国家，每个国家都自称国王，世代相传。
自武帝灭朝鲜，使驿通于汉者三十许国，国皆称王，世世传统。
Since Emperor Wu destroyed Korea, the Japanese sent an envoy, a translator, and a dozen or so other countries to and from the Han, each of which called itself a king and passed on from generation to generation.