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
Even the goddess of the Romano-Latin league, Diana of the Aventine, seems to have been copied from the federal goddess of the lonians of Asia Minor, the Ephesian Artemis; at least her carved image in the Roman temple was formed after the Ephesian type.(17)
17. Cf. I. VII. Servian Wall
It was in this way alone, through the myths of Apollo, Dionysus, Pluto, Herakles, and Artemis, which were early pervaded by Oriental ideas, that the Aramaic religion exercised at this period a remote and indirect influence on Italy. We clearly perceive from these facts that the introduction of the Greek religion was especially due to commercial intercourse, and that it was traders and mariners who primarily brought the Greek gods to Italy.
These individual cases however of derivation from abroad were but of secondary moment, while the remains of the natural symbolism of primeval times, of which the legend of the oxen of Cacus may perhaps be a specimen,(18) had virtually disappeared. In all its leading features the Roman religion was an organic creation of the people among whom we find it.
18. Cf. I. II. Indo-Germanic Culture
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Reference address : https://www.ellopos.net/elpenor/rome/1-12-religion.asp?pg=32