Liu An , a scion of the Imperial House of Han , king of Huai-nan , and better known to us as Huan-nan Tzŭ , who also died by his own hand in BC 122. In the books of all these men we find quotations of many passages that are in our treatise. They are expressly said to be, many of them, quotations from Laozi ; Han Fei several times all but shows the book beneath his eyes. To show how numerous the quotations by Han Fei and Liu An are, let it be borne in mind that the Tao Te Ching