 Though moral relativism did not become a prominent topic in philosophy or elsewhere until the twentieth century, it has ancient origins. In the classical Greek world, both the historian Herodotus and the sophist Protagoras appeared to endorse some form of relativism (the latter attracted the attention of Plato in the Theaetetus). It should also be noted that the ancient Chinese Daoist philosopher Zhuangzi put forward a nonobjectivist view that is sometimes interpreted as a kind of relativism.