Graius is a Celtic god worshipped in Gaul; his name may translate to “terrible one.”
He was sometimes identified by the Romans with their god Hercules by way of the interpretatio romana. Typically the Romans identified the Gaulish god Ogmios with Hercules, equating physical strength with persuasive and rhetorical abilities; it is possible that Graius shared some characteristics with Ogmios as well.
Graius received votive and dedicatory offerings from his worshippers; otherwise little is known of the specifics of his cult.
I’ve seen it suggested that Graius’ name is derived from the Proto-Celtic *gragnos or “horror, terror, grief.”
Graius was worshipped in what is now the Savoie region of France.
Aime, France; Salins-les-Thermes, France