Orcus was a god of the underworld, punisher of broken oaths in Italic and Roman mythology. He was more equivalent to the Roman Pluto than to the Greek Hades, and later identified with Dis Pater. He was portrayed in paintings in Etruscan tombs as a hairy, bearded giant. A temple to Orcus may have existed on the Palatine Hill in Rome. It is likely that he was transliterated from the Greek daemon Horcus, the personification of Oaths and a son of Eris.
The origins of Orcus may have lain in Etruscan religion. Orcus was a name used by Roman writers to identify a Gaulish god of the underworld. The so-called Tomb of Orcus, an Etruscan site at Tarquinia, is a misnomer, resulting from its first discoverers mistaking as Orcus a hairy, bearded giant that was actually a figure of a Cyclops.
The Romans sometimes conflated Orcus with other gods such as Pluto, Hades, and Dis Pater, god of the land of the dead. The name "Orcus" seems to have been given to his evil and punishing side, as the god who tormented evildoers in the afterlife. Like the name Hades (or the Norse Hel, for that matter), "Orcus" could also mean the land of the dead.
Orcus was chiefly worshipped in rural areas; he had no official cult in the cities. This remoteness allowed for him to survive in the countryside long after the more prevalent gods had ceased to be worshipped. He survived as a folk figure into the Middle Ages, and aspects of his worship were transmuted into the wild man festivals held in rural parts of Europe through modern times. Indeed, much of what is known about the celebrations associated with Orcus come from medieval sources.
Survival and later use
From Orcus' association with death and the underworld, his name came to be used for demons and other underworld monsters, particularly in Italian where orco refers to a kind of monster found in fairy-tales that feeds on human flesh. The French word ogre (appearing first in Charles Perrault's fairy-tales) may have come from variant forms of this word, orgo or ogro; in any case, the French ogre and the Italian orco are exactly the same sort of creature. An early example of an orco appears in Ludovico Ariosto's Orlando Furioso, as a bestial, blind, tusk-faced monster inspired by the Cyclops of the Odyssey; this orco should not be confused with the orca, a sea-monster also appearing in Ariosto.
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