"The Horned One" is a Celtic god of fertility, life, animals, wealth, and the underworld. He was worshipped all over Gaul, and his cult spread into Britain as well. Cernunnos is depicted with the antlers of a stag, sometimes carries a purse filled with coin. The Horned God is born at the winter solstice, marries the goddess at Beltane, and dies at the summer solstice. He alternates with the goddess of the moon in ruling over life and death, continuing the cycle of death, rebirth and reincarnation.

Paleolithic cave paintings found in France that depict a stag standing upright or a man dressed in stag costume seem to indicate that Cernunnos' origins date to those times. Romans sometimes portrayed him with three cranes flying above his head. Known to the Druids as Hu Gadarn. God of the underworld and astral planes. The consort of the great goddess. He was often depicted holding a bag of money, or accompanied by a ram-headed serpent and a stag. Most notably is the famous Gundestrup cauldron discovered in Denmark.

From the Encyclopedia Mythica
http://www.pantheon.org/areas/mythology/europe/celtic/articles.html