added by archaeologs
STHE′NIA (σθένια), a festival with contests celebrated by the Argives in honour of Zeus surnamed Sthenius, who had an altar consisting of a large rock in the neighborhood of Hermione. Plutarch states that the πάλη or wrestling, which formed a part of the contests at this festival, was accompanied by the flute; and he also mentions a tradition according to which the festival had originally been held in honour of Danaus, and that it was afterwards consecrated to Zeus Sthenius.
http://penelope.uchicago.edu/Thayer/E/Roman/Texts/secondary/SMIGRA*/Sthenia.html