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
The main matter at any rate was that the communities hitherto Latin--not only the survivors of the old Latin confederacy, such as Tibur and Praeneste, but more especially the Latin colonies, with the exception of the few that passed over to the insurgents--were thereby admitted to Roman citizenship. Besides, the law was applied to the allied cities that remained faithful in Etruria and especially in Southern Italy, such as Nuceria and Neapolis. It was natural that individual communities, hitherto specially privileged, should hesitate as to the acceptance of the franchise; that Neapolis, for example, should scruple to give up its former treaty with Rome--which guaranteed to its citizens exemption from land-service and their Greek constitution, and perhaps domanial advantages besides--for the restricted rights of new burgesses.
It was probably in virtue of conventions concluded on account of these scruples that this city, as well as Rhegium and perhaps other Greek communities in Italy, even after their admission to Roman citizenship retained unchanged their former communal constitution and Greek as their official language. At all events, as a consequence of these laws, the circle of Roman burgesses was extraordinarily enlarged by the merging into it of numerous and important urban communities scattered from the Sicilian Straits to the Po; and, further, the country between the Po and the Alps was, by the bestowal of the best rights of allies, as it were invested with the legal expectancy of full citizenship.
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Reference address : https://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=41