 Among the ancient Greek philosophers, moral diversity was widely acknowledged, but the more common nonobjectivist reaction was moral skepticism, the view that there is no moral knowledge (the position of the Pyrrhonian skeptic Sextus Empiricus), rather than moral relativism, the view that moral truth or justification is relative to a culture or society. This pattern continued through most of the history of Western philosophy. There were certainly occasional discussions of moral disagreement—for example in Michel de Montaigne’s Essays or in the dialogue David Hume attached to An Enquiry Concerning the Principles of Morals. These discussions pertained to moral objectivity, but moral relativism as a thesis explicitly distinguished from moral skepticism ordinarily was not in focus. Prior to the twentieth century, moral philosophers did not generally feel obliged to defend a position on moral relativism.