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
That in this earliest record of the origin of Rome the hand of Hellenism was at work, can scarcely be doubted. The speculations as to the primitive and subsequent population, as to the priority of pastoral life over agriculture, and the transformation of the man Romulus into the god Quirinus,(17) have quite a Greek aspect, and even the obscuring of the genuinely national forms of the pious Numa and the wise Egeria by the admixture of alien elements of Pythagorean primitive wisdom appears by no means to be one of the most recent ingredients in the Roman prehistoric annals.
17. Cf. I. XII. Spirits
The pedigrees of the noble clans were completed in a manner analogous to these -origines- of the community, and were, in the favourite style of heraldry, universally traced back to illustrious ancestors. The Aemilii, for instance, Calpurnii, Pinarii, and Pomponii professed to be descended from the four sons of Numa, Mamercus, Calpus, Pinus, and Pompo; and the Aemilii, yet further, from Mamercus, the son of Pythagoras, who was named the "winning speaker" (--aimulos--)
But, notwithstanding the Greek reminiscences that are everywhere apparent, these prehistoric annals of the community and of the leading houses may be designated at least relatively as national, partly because they originated in Rome, partly because they tended primarily to form links of connection not between Rome and Greece, but between Rome and Latium.
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Reference address : https://www.ellopos.net/elpenor/rome/2-09-art-science.asp?pg=17