Wang Bi
According to the Wei dynastic histories, He Yan enjoyed and had a great insight into the works of the Daoist philosophers Laozi and Zhuangzi, and into the "Book of Changes", from an early age. He wrote a famous commentary that was influential in his own time, the "Commentary on the Daode Jing" ("Daode Lun"), but no copies have survived. He was planning on writing a more detailed, interlinear commentary on the "Daode Jing"; but, after comparing his draft with a similar draft by a younger Wang Bi, He decided that his interpretation was inferior, and the "Commentary" that he eventually produced was more general and broad.