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
No relation is discoverable between the urban settlements thus gradually formed and the three communities into which from an immemorially early period the Roman commonwealth was in political law divided. As the Ramnes, Tities, and Luceres appear to have been communities originally independent, they must have had their settlements originally apart; but they certainly did not dwell in separate circumvallations on the Seven Hills, and all fictions to this effect in ancient or modern times must be consigned by the intelligent inquirer to the same fate with the charming tale of Tarpeia and the battle of the Palatine. On the contrary each of the three tribes of Ramnes, Tities, and Luceres must have been distributed throughout the two regions of the oldest city, the Subura and Palatine, and the suburban region as well: with this may be connected the fact, that afterwards not only in the Suburan and Palatine, but in each of the regions subsequently added to the city, there were three pairs of Argean chapels.
The Palatine city of the Seven Mounts may have had a history of its own; no other tradition of it has survived than simply that of its having once existed. But as the leaves of the forest make room for the new growth of spring, although they fall unseen by human eyes, so has this unknown city of the Seven Mounts made room for the Rome of history.
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Reference address : https://www.ellopos.net/elpenor/rome/1-04-beginnings-rome.asp?pg=14