Cratylus (ancient Greek: ", "Kratylos") was an ancient Athenian philosopher from late 5th century BC, mostly known through his portrayal in Plato's dialogue "Cratylus". Little is known of Cratylus or his mentor Heraclitus (of Ephesus, Asia Minor). According to "Cratylus" at 402a, Heraclitus proclaimed that one cannot step twice into the same stream. Wikipedia
The definitive Wikipedia entry for Cratylus. Wikipedia is the biggest multilingual free-content encyclopedia on the Internet. en.wikipedia.org/wiki/Cratylus
