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490 BCE
480 BCE
470 BCE
460 BCE
450 BCE
440 BCE
430 BCE
420 BCE
485 BCE - 415 BCE: Life of the Sophist Protagoras of Abdera; claim that "man is the measure of all things".
440 BCE: The sophist Protagoras of Abdera, claiming 'man is the measure of all things', visits Athens.