Emperor Wen of Han
Among the many transmitted editions of the "Tao Te Ching" text, the three primary ones are named after early commentaries. The "Yan Zun Version", which is only extant for the "Te Ching", derives from a commentary attributed to Han dynasty scholar Yan Zun (, fl. 80 BC – 10 AD). The "Heshang Gong Version" is named after the legendary Heshang Gong ( "Riverside Sage") who supposedly lived during the reign (180–157 BC) of Emperor Wen of Han. This commentary has a preface written by Ge Xuan (, 164–244 AD), granduncle of Ge Hong, and scholarship dates this version to around the 3rd century AD. The "Wang Bi Version" has more verifiable origins than either of the above. Wang Bi (, 226–249 AD) was a famous Three Kingdoms period philosopher and commentator on the "Tao Te Ching" and the "I Ching".