Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Nature of the Roman Gods
It is no part of our present task to consider the Roman deities in detail; but it is important, even in an historical point of view, to call attention to the peculiar character at once of shallowness and of fervour that marked the Roman faith. Abstraction and personification lay at the root of the Roman as well as of the Greek mythology: the Greek as well as the Roman god was originally suggested by some natural phenomenon or some mental conception, and to the Roman just as to the Greek every divinity appeared a person.
This is evident from their apprehending the individual gods as male or female; from their style of appeal to an unknown deity,--"Be thou god or goddess, man or woman;" and from the deeply cherished belief that the name of the proper tutelary spirit of the community ought to remain for ever unpronounced, lest an enemy should come to learn it and calling the god by his name should entice him beyond the bounds. A remnant of this strongly sensuous mode of apprehension clung to Mars in particular, the oldest and most national form of divinity in Italy.
But while abstraction, which lies at the foundation of every religion, elsewhere endeavoured to rise to wider and more enlarged conceptions and to penetrate ever more deeply into the essence of things, the forms of the Roman faith remained at, or sank to, a singularly low level of conception and of insight. While in the case of the Greek every influential motive speedily expanded into a group of forms and gathered around it a circle of legends and ideas, in the case of the Roman the fundamental thought remained stationary in its original naked rigidity.
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Reference address : https://www.ellopos.net/elpenor/rome/1-12-religion.asp?pg=7