Ancient Roman divine presence
Numen (plural numina) is a Latin term for "divinity", "divine presence", or "divine will". The Latin authors defined it as follows: Cicero writes of a "divine mind" (), a god "whose numen everything obeys", and a "divine power" () "which pervades the lives of men". It causes the motions and cries of birds during augury. In Virgil's recounting of the blinding of the one-eyed giant, Polyphemus, from the "Odyssey", in his "Aeneid", he has Odysseus and his men first "ask for the assistance of the great numina" (). Reviewing public opinion of Augustus on the day of his funeral, the historian Tacitus reports that some thought "no honor was left to the gods" when he "established the cult of himself" () "with temples and the effigies of numina" (). Pliny the Younger in a letter to Paternus raves about the "power", the "dignity", and "the majesty"; in short, the ""numen" of history". Lucretius uses the expression , or "bidding of the mind", where "bidding" is "numen", not, however, the divine numen, unless the mind is to be considered divine, but as simply human will.
Since the early 20th century, numen has sometimes been treated in the history of religion as a pre-animistic phase; that is, a belief system inherited from an earlier time. "Numen" is also used by sociologists to refer to the idea of magical power residing in an object, particularly when writing about ideas in the western tradition. When used in this sense, "numen" is nearly synonymous with "mana". However, some authors reserve use of "mana" for ideas about magic from Polynesia and Southeast Asia.
Etymology.
Etymologically, the word means "a nod of the head", here referring to a deity as it were "nodding", or making its will or its presence known. According to H. J. Rose: 
The literal meaning is simply "a nod", or more accurately, for it is a passive formation, "that which is produced by nodding", just as "flamen" is "that which is produced by blowing", "i.e.", a gust of wind. It came to mean "the product or expression of power" — not, be it noted, power itself.
Thus, "numen" (divinity) is not personified (although it can be a personal attribute) and should be distinguished from "deus" (god).
Roman cults of the numina.
Numen was also used in the imperial cult of ancient Rome, to refer to the guardian-spirit, 'godhead' or divine power of a living emperor—in other words, a means of worshiping a living emperor without literally calling him a god.
The cult of Augustus was promoted by Tiberius, who dedicated the "Ara Numinis Augusti".
In this context, a distinction can be made between the terms "numen" and "genius".
Definition as a pre-animistic phase of religion.
The expression "Numen inest" appears in Ovid's "Fasti" (III, 296) and has been translated as "There is a spirit here". Its interpretation, and in particular the exact sense of "numen" has been discussed extensively in the literature.
The supposition that a "numinous presence" in the natural world supposed in the earliest layers of Italic religion, as it were an "animistic" element left over in historical Roman religion and especially in the etymology of Latin theonyms, has often been popularly implied, but was criticised as "mostly a scholarly fiction" by McGeough (2004).
Numina and specific religions.
The phrase "numen eris caeloque redux mirabere regna" appears on line 129 of the poem "Metrum in Genesin", attributed to Hilary of Arles.
References.
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