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
In the time of the empire there were still recognized Alban clans which were introduced among the burgesses of Rome after the fall of their native seat; amongst these were the Julii, Servilii, Quinctilii, Cloelii, Geganii, Curiatii, Metilii: the memory of their descent was preserved by their Alban family shrines, among which the sanctuary of the -gens- of the Julii at Bovillae again rose under the empire into great repute.
This centralizing process, by which several small communities became absorbed in a larger one, of course was far from being an idea specially Roman. Not only did the development of Latium and of the Sabellian stocks hinge upon the distinction between national centralization and cantonal independence; the case was the same with the development of the Greeks. Rome in Latium and Athens in Attica arose out of a like amalgamation of many cantons into one state; and the wise Thales suggested a similar fusion to the hard-pressed league of the Ionic cities as the only means of saving their nationality.
But Rome adhered to this principle of unity with more consistency, earnestness, and success than any other Italian canton; and just as the prominent position of Athens in Greece was the effect of her early centralization, so Rome was indebted for her greatness solely to the same system, in her case far more energetically applied,
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Reference address : https://www.ellopos.net/elpenor/rome/1-07-hegemony-rome-latium.asp?pg=6