One of the most important annotators of Wei Shu after Zheng Xuan, Song Jun is, however, not the one and the same figure according to the records of Chinese history monographs. And consequently we are not sure that which Song Jun has annotated Wei Shu. The present article holds Song Jun, the genuine annotator, was born at the end of the Eastern Han Dynasty and died at the beginning of the Western Jin Dynasty. He, as a scholar-official of the Wei Dynasty, has probably subjoined the edition of Wei Shu already annotated by Zheng Xuan.
