 This view was first, and perhaps most famously, expressed by Socrates and Protagoras in the Platonic dialogue, Protagoras (Plato 1976 [C4 BCE], 351b–c). Jeremy Bentham, one of the most well-known of the more recent hedonists, begins his Introduction to the Principles of Morals and Legislation thus: ‘Nature has placed mankind under the governance of two sovereign masters, pain and pleasure. It is for them alone to point out what we ought to do’.