Gorgias of Leontini
c.485-c.380 BCE
Nothing exists; if it exists, it cannot be known; if it can…
Prodicus of Ceos
c.465-c.395 BCE
Precise distinction of near-synonyms reveals concepts' true meanings — "enjoy" differs from…
Protagoras of Abdera
c.490-c.420 BCE
Man is the measure of all things — what appears to each…
Thrasymachus of Chalcedon
c.459-c.400 BCE
Justice is nothing but the advantage of the stronger — rulers establish…