The first texts that make an explicit connection between Jizi and Joseon date from the second century BC, under the Han dynasty.. The earliest known source stating that Jizi went to Joseon is the Shangshu dazhuan (尚書大傳), a commentary on the Book of Documents attributed to Fu Sheng of the second century BC. In that account, King Wu enfeoffed Jizi as the ruler of Joseon and Jizi became the subject of King Wu., pp. 274-75. In a similar story recorded in Sima Qian's Records of the Grand Historian (or Shiji, compiled between 109 and 91 BC), Jizi was enfeoffed by King Wu but did not become his subject. Sima Qian did not mention Jizi in his section on contemporary Joseon (i.e. northwestern Korea), where Wei Man's kingdom had flourished since about 194 BC until it was conquered by the Han Dynasty in 108 BC. Thus the location of Joseon as in these earlier sources is not clear. Among other Han dynasty sources, the Han shi waizhuan mentions to Jizi but not his migration to Joseon.
