Pang Juan
During the late Warring States period, a hermit named Guigu Xiansheng was said to have compiled the Guiguzi, a work that discusses techniques of political lobbying based in Taoist thinking. He conveyed the teachings of this School of Diplomacy to Su Qin, Zhang Yi, Sun Bin and Pang Juan, who would all go on to become famed military strategists and diplomats. Zhang Yi, in particular, paved the way for the domination of the Qin Dynasty and helped found the school of Legalism as the dynasty's guiding philosophy. After the Qin centralized power and brought the period of civil conflict to a close, they engaged in the burning of books and burying of scholars - many Taoist works were presumed lost. As such, many of the Zhou-era Taoist texts are sourced during the Han dynasty, and the existence of many of the Zhou-era Taoist sages and texts are still disputed.