Description of Greece
Pausanias
Pausanias. Pausanias Description of Greece, Volumes 1-4. Jones, W.H.S. (William Henry Samuel), translator; Ormerod, Henry Arderne, translator. London, New York: W. Heinemann, G.P. Putnam's Sons, 1918-1935.
But I cannot bring myself to believe that Heracles did not know the facts about the chest, if they were as described, nor, if he were aware of them, do I think that he would ever have given it to an ally as a gift. Further, the people of Patrae have no tradition of a Eurypylus save the son of Euaemon, and to him every year they sacrifice as to a hero, when they celebrate the festival in honor of Dionysus.