Arimanius is a name for an obscure deity found in a few Greek literary texts and five Latin inscriptions. In Greek texts, Areimanios, with variations, seems to refer to the Persian Ahriman, in the context of "Zoroastrianism" as interpreted by the Greeks and Romans. Those Latin inscriptions which are found in a Mithraic context suggest a redefined or different deity. The most extended passage in classical literature on Areimanios is two sections within Plutarch's treatise Isis and Osiris, who describes him as the dark or evil side in a dualistic opposition with Oromazes. Areimanios is also mentioned in other texts as an evil daimon, "the worst spirit", or even equated with Satan as "the adversary".
The name
The most common form of the name in its few occurrences among Greek authors is Ἀρειμανιος, presumably rendering an unattested Old Persian form *ahramanyu, which, however, would have yielded a Middle Persianahrmen. The name is given as Ἀριμάνης ' by Agathias, and Ἀρειμανής ' by Hesychius, rendering the Middle Persian Ahreman. Variations of the name not explicable by systematic linguistics may be attributed to its similarity to Greek words meaning "warlike" .
According to Plutarch, 46, Zoroaster named "Areimanios" as one of the two rivals who were the artificers of good and evil. In terms of sense perception, Oromazes was to be compared with light, and Areimanios to darkness and ignorance; between these was Mithras the Mediator. Areimanios received offerings that pertained to apotropaism and mourning. In describing a ritual to Areimanios, Plutarch says the god was invoked as Hades and darkness. The Areimanios ritual required an otherwise-unknown plant that Plutarch calls "omomi", which was to be pounded in a mortar and mixed with the blood of a sacrificed wolf. The substance was then carried to a place "where the sun never shines" and cast therein. He adds that "water-rats" belong to this god, and therefore proficient rat-killers are fortunate men. Plutarch then gives a cosmogonical myth:
Oromazes, born from the purest light, and Areimanius, born from darkness, are constantly at war with each other; and Oromazes created six gods, the first of Good Thought, the second of Truth, the third of Order, and, of the rest, one of Wisdom, one of Wealth, and one the Artificer of Pleasure in what is Honourable. But Areimanius created rivals, as it were, equal to these in number. Then Oromazes enlarged himself to thrice his former size, and removed himself as far distant from the Sun as the Sun is distant from the Earth, and adorned the heavens with stars. One star he set there before all others as a guardian and watchman, the Dog-star. Twenty-four other gods he created and placed in an egg. But those created by Areimanius, who were equal in number to the others, pierced through the egg and made their way inside; hence evils are now combined with good. But a destined time shall come when it is decreed that Areimanius, engaged in bringing on pestilence and famine, shall by these be utterly annihilated and shall disappear; and then shall the earth become a level plain, and there shall be one manner of life and one form of government for a blessed people who shall all speak one tongue. Plutarch, 47.
Scholar Mary Boyce asserted that the passage shows a "fairly accurate" knowledge of basic Zoroastrianism. In his Life of Themistocles, Plutarch has the Persian king invoke Areimanios by name, asking the god to cause the king's enemies to behave in such a way as to drive away their own best men. It has been doubted that a Persian king would pray to the god of evil, particularly in public. According to Plutarch, the king then made a sacrifice and got drunk - a virtual motif of how Persian kings act in Plutarch - and thus dubious evidence for actual behavior. , Italy
As a Mithraic god
was the proponent of a now-unfashionable view that Greco-Roman Mithraism had been influenced by some beliefs of ancient Mazdaism, including ethical dualism. No evidence of a place in a mithraeum for the "omomi" cult described by Plutarch has been found. Most scholars doubt that Mithraists preserved the doctrine of Persian magi, despite appeals to their authority, but the name Arimanius is difficult to divorce from the Persian tradition of Ahriman, but the association of Mithras with an evil god has been dismissed by some scholars as inherently implausible. Nonetheless, the inscription Deo Areimanio is found on a few altars to Mithras, without any description that would link him with a particular image. There are five high-quality dedications to Arimanius found throughout the Roman Empire. The text of the dedications suggest that Arimanius was not conceived of as an evil being in a Mithraic context, however formidable; Gordon remarks: “the real point is surely that we know nothing of any importance about Western Areimanius.” Occultist D. J. Cooper conjectures that the lion-headed figure does not represent a god, but rather shows the spiritual state achieved in Mithraism's "adept" level - the Leo degree. If so, it would be another reason to un-link the name Arimanius from the lion-headed figure.
Roman Britain
A mutilated statue at York has a fragmentary dedicatory inscription that has been read as containing the name Arimanius. The figure seems to be entwined with a serpent, and at one time it was conjectured that it represented the lion-headed god of Mithraism or a form of the Mithraic Aion. But since Arimanius can also be a personal name, it is uncertain whether it refers in the inscription to the god represented by the statue, or to the person who made the votive dedication. No other Mithraic objects were uncovered near the statue, and any leonine features are subject to fancy.
