A sceptic. Pyrrho was the founder of the sceptical school of philosophy. He was a native of Elis, in Peloponnesos.
Blessed be the day I'scaped the wrangling crew From Pyrrho's maze and Epicurus' sty.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894
More on Pyrrho from Infoplease: