Protagoras is Born
Protagoras (Greek: Πρωταγόρας) (ca.
490– 420 BC) was a pre-Socratic Greek philosopher and is numbered as one of the sophists by Plato. In his dialogue Protagoras, Plato credits him with having invented the role of the professional sophist or teacher of virtue. He is also believed to have created a major controversy during ancient times through his statement that man is the measure of all things. This idea was very revolutionary for the time and contrasting to other philosophical doctrines that claimed the universe was based on something objective, outside the human influence.
Protagoras was born in Abdera, Thrace, in Ancient Greece. "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 (91e) 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?"