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
These towns retained the restricted self-administration, which under their earlier legal position belonged to them, even after their admission into the Roman burgess-union; it was they more than the maritime colonies that furnished the model for the special commonwealths subsisting within the body of Roman full burgesses and so, in the course of time, for the Roman municipal organization.
Accordingly the range of the full Roman burgesses must at the end of this epoch have extended northward as far as the vicinity of Caere, eastward as far as the Apennines, and southward as far as Tarracina; although in this case indeed we cannot speak of boundary in a strict sense, partly because a number of federal towns with Latin rights, such as Tibur, Praeneste, Signia, Norba, Circeii, were found within these bounds, partly because beyond them the inhabitants of Minturnae, Sinuessa, of the Falernian territory, of the town Sena Gallica and some other townships, likewise possessed the full franchise, and families of Roman farmers were presumably to be even now found scattered throughout Italy, either isolated or united in villages.
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Reference address : https://www.ellopos.net/elpenor/rome/2-07-pyrrhus-rome-italy.asp?pg=69