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 Falerii, the town of Etruria nearest to the frontier of Umbria and the Sabine country, according to the testimony of Strabo a language was spoken different from the Etruscan, and inscriptions bearing out that statement have recently been brought to light there, the alphabet and language of which, while presenting points of contact with the Etruscan, exhibit a general resemblance to the Latin.(1)
1. In the alphabet the "r" especially deserves notice, being of the Latin and not of the Etruscan form, and also the "z"; it can only be derived from the primitive Latin, and must very faithfully represent it. The language likewise has close affinity with the oldest Latin; -Marci Acarcelini he cupa-, that is, -Marcius Acarcelinius heic cubat-: -Menerva A. Cotena La. f...zenatuo sentem..dedet cuando..cuncaptum-, that is, -Minervae A(ulus?) Cotena La(rtis) f(ilius) de senatus sententia dedit quando (perhaps=olim) conceptum-. At the same time with these and similar inscriptions there have been found some others in a different character and language, undoubtedly Etruscan.
The local worship also presents traces of a Sabellian character; and a similar inference is suggested by the primitive relations subsisting in sacred as well as other matters between Caere and Rome. It is probable that the Etruscans wrested those southern districts from the Umbrians at a period considerably subsequent to their occupation of the country on the north of the Ciminian Forest, and that an Umbrian population maintained itself there even after the Tuscan conquest. In this fact we may presumably find the ultimate explanation of the surprising rapidity with which the southern portion of Etruria became Latinized, as compared with the tenacious retention of the Etruscan language and manners in northern Etruria, after the Roman conquest.
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Reference address : https://www.ellopos.net/elpenor/rome/1-08-umbro-sabellian-samnites.asp?pg=2