Definitions for pythiasˈpɪθ i əs
Random House Webster's College Dictionary
Pyth•i•asˈpɪθ i əs(n.)
a legendary Greek of ancient Syracuse, sentenced to death by the tyrant Dionysius.
Ref: Compare Damon and Pythias.
friend of Damon; Phintias (according to legend) was condemned to death by Dionysius the Elder and asked a respite to put his affairs in order; Damon pledged his life for the return of his friend; when Phintias returned in time the tyrant released them both (4th century BC)