Cernunnos or The Horned God is a deity worshipped by the iron age Celts all across Europe around the first century AD. He is, first and foremost, the god of fertility; in his "horned god" facet, he is depicted with male fertility symbols, like the antlers and the snake. But he is also the lord of the beasts and everything that grows in the forest, therefore, he is clearly related to the "Green Man" covered with leaves.
He is also the God of the Hunt. The stag was sacred to Celtic hunters, who believed it to represent the qualities of masculinity, vigilance, alertness, agression and potency, which one sees during the Stag's rutting season.
In Neopaganism, Cernunnos is refered to as the Sun God, son and consort to the Moon Goddes.