The divinity of the serpent is proved by the occurrence of a horned serpent with twelve Roman gods on a Gallo-Roman altar.[711] In other cases a horned or ram's-headed serpent appears as the attribute of a god, and we have seen that the ram's-headed serpent may be a fusion of the serpent as a chthonian animal with the ram, sacrificed to the dead. In Greece Dionysus had the form both of a bull and a horned serpent, the horn being perhaps derived from the bull symbol. M. Reinach claims that the primitive elements of the Orphic myth of the Thracian Dionysos-Zagreus--divine serpents producing an egg whence came the horned snake Zagreus, occur in dislocated form in Gaul. There enlacing serpents were believed to produce a magic egg, and there a horned serpent was worshipped, but was not connected with the egg. But they may once have been connected, and if so, there may be a common foundation both for the Greek and the Celtic conceptions in a Celtic element in Thrace.[712] The resemblances, however, may be mere coincidences, and horned serpents are known in other mythologies--the horn being perhaps a symbol of divinity. The horned serpent sometimes accompanies a god who has horns, possibly Cernunnos, the underworld god, in accordance with the chthonian character of the serpent.[713] In the Cùchulainn cycle Loeg on his visit to the Other-world saw two-headed serpents--perhaps a further hint of this aspect of the animal.[714] In all these instances of animal cults examples of the tendency to make the divine animal anthropomorphic have been seen. We have now to consider some instances of the complete anthropomorphic process. 2.