“The Sophists” generally refers to Protagoras, Gorgias, Hippias, Prodicus, and Antiphon, as well as to a few lesser-known fifth-century figures; but why it does so, and what holds these men together, has been a matter of debate from Plato’s time to our own. Neither of the two standard explanations fit all and only these figures – the philosophical one, that they share some revolutionary epistemological outlook (for instance, relativism or anti-realism), or the sociological one, that they are primarily teachers of virtue of pay. This Introduction proposes revisiting the Sophists as celebrated instances of their time, a period of energetic intellectual discovery, experimentation, and communication. Doing so opens new questions about their continuity with their background culture as well as any distinctive interests, methods, or beliefs they might have. The Introduction goes on to discuss all early uses of the term sophistês in the fifth century (from Pindar through Thucydides) and its dominant uses in the fourth century, allowing us to see the range of kinds of people it applied to and the force with which it was applied. Then it describes the heterogeneous evidence base for Sophists and cognate figures. It concludes with a summary of the volume’s chapters.

Fourth-century philosophy-aligned authors often present negative views of “sophistry” but more charitable views of those fifth-century individuals they call “Sophist” or include among “the Sophists.” This chapter attends to this often unacknowledged difference, giving evidence for it and offering several explanations. It reviews what fourth-century authors – Isocrates, Alcidamas, Xenophon, Plato, and Aristotle – said about the canonical fifth-century Sophists, Gorgias in particular but also Protagoras, Hippias, Prodicus, and Antiphon. It then assesses what they said about “sophistry,” which they usually presented atemporally, not specifically a phenomenon of a previous generation. Along the way, the chapter discusses how this later generation posited what is now seen as a “Sophistic movement,” the rise of a coherent group of paid teachers of rhetoric and civically valuable skills. Plato, long held responsible for this position, does play an important role, but for reasons connected to his dramatic presentation of Socrates.