 The idea that our actual moral judgments are an important source of information about the origins and justification of moral norms goes back to ancient Greece, if not further. Herodotus recounts a story in which the Persian emperor Darius invited Greek members of his court “and asked them what price would persuade them to eat the dead bodies of their fathers. They answered that there was no price for which they would do it.” Darius then summoned members of a different group, “and asked them… what would make them willing to burn their fathers at death. The Indians cried aloud, that he should not speak of so horrid an act.” Herodotus concludes that stories like these prove that, as the poet Pindar writes, “custom is king of all,” thereby providing an instance of the argument from moral disagreement for relativism. Likewise, in the Outlines of Skepticism, Sextus Empiricus stresses that empirical discoveries can destabilize our confidence in universal moral agreement: