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
Such was the nature and such the influence of the Roman religion in its pure, unhampered, and thoroughly national development. Its national character was not infringed by the fact that, from the earliest times, modes and systems of worship were introduced from abroad; no more than the bestowal of the rights of citizenship on individual foreigners denationalized the Roman state. An exchange of gods as well as of goods with the Latins in older time must have been a matter of course; the transplantation to Rome of gods and worships belonging to less cognate races is more remarkable. Of the distinctive Sabine worship maintained by the Tities we have already spoken.(14)
14. Cf. I. XII. Priests
Whether any conceptions of the gods were borrowed from Etruria is more doubtful: for the Lases, the older designation of the genii (from -lascivus-), and Minerva the goddess of memory (-mens-, -menervare-), which it is customary to describe as originally Etruscan, were on the contrary, judging from philological grounds, indigenous to Latium. It is at any rate certain, and in keeping with all that we otherwise know of Roman intercourse that the Greek worship received earlier and more extensive attention in Rome than any other of foreign origin. The Greek oracles furnished the earliest occasion of its introduction. The language of the Roman gods was on the whole confined to Yea and Nay or at the most to the making their will known by the method of casting lots, which appears in its origin Italian;(15) while from very ancient times--although not apparently until the impulse was received from the East--the more talkative gods of the Greeks imparted actual utterances of prophecy.
15. -Sors- from -serere-, to place in row. The -sortes- were probably small wooden tablets arranged upon a string, which when thrown formed figures of various kinds; an arrangement which puts one in mind of the Runic characters.
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Reference address : https://www.ellopos.net/elpenor/rome/1-12-religion.asp?pg=29