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
What sort of crises, if any, preceded or followed the acknowledgment of this claim, we cannot tell. Upon the whole the hegemony of Rome over Latium appears to have been speedily and generally recognized, although particular communities, such as Labici and above all Gabii, may for a time have declined to own it. Even at that time Rome was probably a maritime power in contrast to the Latin "land," a city in contrast to the Latin villages, and a single state in contrast to the Latin confederacy; even at that time it was only in conjunction with and by means of Rome that the Latins could defend their coasts against Carthaginians, Greeks, and Etruscans, and maintain and extend their landward frontier in opposition to their restless neighbours of the Sabellian stock.
Whether the accession to her material resources which Rome obtained by the subjugation of Alba was greater than the increase of her power obtained by the capture of Antemnae or Collatia, cannot be ascertained: it is quite possible that it was not by the conquest of Alba that Rome was first constituted the most powerful community in Latium; she may have been so long before; but she did gain in consequence of that event the presidency at the Latin festival, which became the basis of the future hegemony of the Roman community over the whole Latin confederacy. It is important to indicate as definitely as possible the nature of a relation so influential.
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Reference address : https://www.ellopos.net/elpenor/rome/1-07-hegemony-rome-latium.asp?pg=8