Background
Protagoras was born in Abdera, Thrace, in Ancient Greece. According to Aulus Gellius, he originally made his living as a porter, but one day he was seen by the philosopher Democritus carrying a load of small pieces of wood tied with a short cord. Democritus discovered that Protagoras had tied the load himself with such perfect geometric accuracy that it revealed him to be a mathematic prodigy. He immediately took him into his own household and taught him philosophy.
In Plato's Protagoras, before the company of Socrates, Prodicus, and Hippias, he states that he is old enough to be the father of any of them. This suggests a date of not later than 490 BC. In the Meno he is said to have died at about the age of 70 after 40 years as a practicing Sophist. His death, then, may be assumed to have occurred circa 420. He was well known in Athens and became a friend of Pericles.
Plutarch relates a story in which the two spend a whole day discussing an interesting point of legal responsibility, that probably involved a more philosophical question of causation: "In an athletic contest a man had been accidentally hit and killed with a javelin. Was his death to be attributed to the javelin itself, to the man who threw it, or to the authorities responsible for the conduct of the games?"
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