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'''Protagoras''' (c. 490 - c. 420 BC) was a [[Presocratic Philosophy|Presocratic]] [[Greek]] [[philosopher]]. According to [[Diogenes Laertius]] Protagoras studied with [[Democritus]].  

'''Protagoras''' (c. 490 - c. 420 BC) was a [[Presocratic Philosophy|Presocratic]] [[Greek]] [[philosopher]]. According to [[Diogenes Laertius]] Protagoras studied with [[Democritus]].  

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, considering him a sophist; [[Aristotle]] regarded Protagoras as who first introduced a spiritual principle, as a sober man among the inebriated.   

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, considering him a [[sophist]]; [[Aristotle]] regarded Protagoras as who first introduced a spiritual principle, as a sober man among the inebriated.   

Protagoras' doctrines can be divided into three groups:

Protagoras' doctrines can be divided into three groups:

<center>''"Man is the measure of all things".''</center>

<center>''"Man is the measure of all things".''</center>

Greek philosophers, Gorgias and Hippias were also [[Sophist]]s.  

Greek philosophers, [[Gorgias]] and [[Hippias]] were also Sophists.  

== Protagoras (fragment) ==

== Protagoras (fragment) ==