Pigs have in contrast been sacred in several religions, including the Druids of Ireland, whose priests were called swine. One of the animals sacred to the Roman goddess Diana was the boar; she sent the Calydonian boar to destroy the land. In Hinduism, the boar-headed Varaha is venerated as an avatar of the god Vishnu. The sow was sacred to the Egyptian goddess Isis and used in sacrifice to Osiris.