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
Setting aside self-contradictory and unfounded hypotheses, we may sum up in a few words all that can be said respecting the nationality of the component elements of the primitive Roman commonwealth. That the Ramnians were a Latin stock cannot be doubted, for they gave their name to the new Roman commonwealth and therefore must have substantially determined the nationality of the united community. Respecting the origin of the Luceres nothing can be affirmed, except that there is no difficulty in the way of our assigning them, like the Ramnians, to the Latin stock. The second of these communities, on the other hand, is with one consent derived from Sabina; and this view can at least be traced to a tradition preserved in the Titian brotherhood, which represented that priestly college as having been instituted, on occasion of the Tities being admitted into the collective community, for the preservation of their distinctive Sabine ritual.
It may be, therefore, that at a period very remote, when the Latin and Sabellian stocks were beyond question far less sharply contrasted in language, manners, and customs than were the Roman and the Samnite of a later age, a Sabellian community entered into a Latin canton-union; and, as in the older and more credible traditions without exception the Tities take precedence of the Ramnians, it is probable that the intruding Tities compelled the older Ramnians to accept the --synoikismos--. A mixture of different nationalities certainly therefore took place; but it hardly exercised an influence greater than the migration, for example, which occurred some centuries afterwards of the Sabine Attus Clauzus or Appius Claudius and his clansmen and clients to Rome.
The earlier admission of the Tities among the Ramnians does not entitle us to class the community among mongrel peoples any more than does that subsequent reception of the Claudii among the Romans. With the exception, perhaps, of isolated national institutions handed down in connection with ritual, the existence of Sabellian elements can nowhere be pointed out in Rome; and the Latin language in particular furnishes absolutely no support to any such hypothesis.(4) It would in fact be more than surprising, if the Latin nation should have had its nationality in any sensible degree affected by the insertion of a single community from a stock so very closely related to it; and, besides, it must not be forgotten that at the time when the Tides settled beside the Ramnians, Latin nationality rested on Latium as its basis, and not on Rome. The new tripartite Roman commonwealth was, notwithstanding some incidental elements which were originally Sabellian, just what the community of the Ramnians had previously been--a portion of the Latin nation.
4. Although the older opinion, that Latin is to be viewed as a mixed language made up of Greek and non-Greek elements, has been now abandoned on all sides, judicious inquirers even (e. g. Schwegler, R. G. i. 184, 193) still seek to discover in Latin a mixture of two nearly related Italian dialects. But we ask in vain for the linguistic or historical facts which render such an hypothesis necessary. When a language presents the appearance of being an intermediate link between two others, every philologist knows that the phenomenon may quite as probably depend, and more frequently does depend, on organic development than on external intermixture.
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Reference address : https://www.ellopos.net/elpenor/rome/1-04-beginnings-rome.asp?pg=3