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'''Protagoras''' (c. 490 - c. 420 BC) was a [[Greek]] [[philosopher]].
Diogenes Laertius' book "Lives of the Philosophers" is source for many early Greek philosophers including Protagoras; but this work was compiled over six hundred years after Protagoras' death and consequently not accurate. [[Plato]] also wrote about Protagoras; [[Aristotle]] regarded Protagoras as who first introduced a spiritual principle, as a sober man among the inebriated.
<blockquote>
Protagoras' doctrines can be divided into three groups:
1. Orthoepeia: the study of the correct use of words
2. Man-measure statement: the notion that knowledge is relative to the knower
3. Agnosticism: the claim that we cannot know anything about the gods. [http://www.iep.utm.edu/p/protagor.htm]
</blockquote>
== See also ==
*[[Philosophy]]
*[[Greek philosophers]]
== External links ==
*[http://classics.mit.edu/Plato/protagoras.html Protagoras By Plato] The Internet Classics Archive.
[[Category:Ancient Greek Philosophers]]