Cernunnos is a Celtic stag god. His name is only certainly attested once, on the 1st-century Pillar of the Boatmen from Paris, where it is associated with an image of an aged, antlered figure with torcs around his horns.
Through the Pillar of the Boatmen, Cernunnos has been connected with over twenty-five other depictions of antlered figures. He has a complicated iconography, in which he is portrayed with antlers and crossed legs, and associated with torcs, stags, and ram-headed serpents (among other wild animals). The meaning and origin of these attributes have been much debated. The cult of Cernunnos is best attested in north-eastern Gaul, but depictions of the god have been identified as far off as Italy (Val Camonica) and Denmark (Gundestrup).
Cernunnos has been interpreted as a god of fertility, of the underworld, and of bi-directionality. His cult seems to have been largely unaffected by the Roman conquest of Gaul, during which he remained unassimilated to the Roman pantheon. Cernunnos has been tentatively linked with Conall Cernach, a hero of medieval Irish mythology, and some later depictions of cross-legged and horned figures in medieval art.