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
The religion of Rome had nothing of its own presenting even a remote resemblance to the religion of Apollo investing earthly morality with a halo of glory, to the divine intoxication of Dionysus, or to the Chthonian and mystical worships with their profound and hidden meanings. It had indeed its "bad god" (-Ve-diovis-), its apparitions and ghosts (-lemures-), and afterwards its deities of foul air, of fever, of diseases, perhaps even of theft (-laverna-); but it was unable to excite that mysterious awe after which the human heart has always a longing, or thoroughly to embody the incomprehensible and even the malignant elements in nature and in man, which must not be wanting in religion if it would reflect man as a whole. In the religion of Rome there was hardly anything secret except possibly the names of the gods of the city, the Penates; the real character, moreover, even of these gods was manifest to every one.
The national Roman theology sought on all hands to form distinct conceptions of important phenomena and qualities, to express them in its terminology, and to classify them systematically--in the first instance, according to that division of persons and things which also formed the basis of private law--that it might thus be able in due fashion to invoke the gods individually or by classes, and to point out (-indigitare-) to the multitude the modes of appropriate invocation.
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Reference address : https://www.ellopos.net/elpenor/rome/1-12-religion.asp?pg=8