n this video, I offer a brief introduction to the pre-Socratic philosopher Protagoras, who most famously wrote that "man is the measure of all things." Protagoras lived in the 5th century and none of his works survived. The only accounts of him we have are from adversaries like Plato and biographers like Diogenes Laertius. He is frequently called a Sophist and is argued to be one of the first relativists. Here, I extrapolate what we do (and don't) know about what Protagoras believed.

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