In ancient Roman religion and myth, Faunus was the horned god of the forest, plains and fields; when he made cattle fertile he was called Inuus. He came to be equated in literature with the Greek god Pan.
Faunus was one of the oldest Roman deities, known as the di indigetes. According to the epic poet Virgil, he was a legendary king of the Latins who came with his people from Arcadia. His shade was consulted as a god of prophecy under the name of Fatuus, with oracles in the sacred grove of Tibur, around the well Albunea, and on the Aventine Hill in ancient Rome itself 
Marcus Terentius Varro asserted that the oracular responses were given in Saturnian verse. Faunus revealed the future in dreams and voices that were communicated to those who came to sleep in his precincts, lying on the fleeces of sacrificed lambs. W. Warde Fowler suggested that Faunus is identical with Favonius, one of the Roman wind gods (compare the Anemoi).
Consorts and family
A goddess of like attributes, called Fauna and Fatua, was associated in his worship. She was regarded sometimes as his wife, sometimes as his sister. As Pan was accompanied by the Paniskoi, or little Pans, so the existence of many Fauni was assumed besides the chief Faunus. In fable Faunus appears as an old king of Latium, son of Picus, and grandson of Saturnus, father of Latinus by the nymph Marica. After his death he is raised to the position of a tutelary deity of the land, for his many services to agriculture and cattle-breeding.
Faunus was known as the father or husband or brother of Bona Dea (Fauna, his feminine side) and Latinus by the nymph Marica (who was also sometimes Faunus' mother). Fauns are place-spirits (genii) of untamed woodland. Educated, Hellenizing Romans connected their fauns with the Greek satyrs, who were wild and orgiastic drunken followers of Dionysus, with a distinct origin.
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