Protagoras
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Protagoras was a pre-Socratic Greek philosopher and rhetorical theorist. He is numbered as one of the sophists by Plato. In his dialogue Protagoras, Plato credits him with inventing the role of the pr
Protagoras by Jusepe de Ribera, 1637
Democritus and Protagoras by Salvator Rosa; it is said that Protagoras was educated on philosophy by Democritus, but this is likely apocryphal.
Pre-Socratic philosophy
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Pre-Socratic philosophy, also known as early Greek philosophy, is ancient Greek philosophy before Socrates. Pre-Socratic philosophers were mostly interested in cosmology, the beginning and the substan
Protagoras
…Protagoras ( proh-TAG-ər-əs, -ass; Greek: Πρωταγόρας; c. 490 BC – c. 420 BC) was a pre-Socratic Greek philosopher and rhetorical theorist. He is numbered as one of the sophists by Plato. In his dialogue Protagoras, Plato credits him with inventing…
Pythagoras
Parmenides
Heraclitus
St. Elmo's fire (luminous plasma created by a corona discharge from a rod-like object) in a ship. Xenophanes' contemporaries attributed this phenomenon to the deity Dioscuri. Xenophanes argued that the observed illumination is due to small clouds influenced by special circumstances relating to stars—an example of naturalism and reductionism.