He moved to Athens where tradition says he became a pupil of Diogenes of Sinope; the precise relationship between Crates and Diogenes is uncertain, but there is one apparent reference to Crates referring to himself as "a fellow-citizen of Diogenes, who defied all the plots of envy". Crates is also described as being the student of Bryson the Achaean, and of Stilpo. He lived a life of cheerful simplicity, and Plutarch, who wrote a detailed biography of Crates which unfortunately does not survive, records what sort of man Crates was: