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
Etruria Proper at Peace and on the Decline
Thus the Etruscans, after the loss of their possessions in Campania and of the whole district to the north of the Apennines and to the south of the Ciminian Forest, remained restricted to very narrow bounds; their season of power and of aspiration had for ever passed away. The closest reciprocal relations subsisted between this external decline and the internal decay of the nation, the seeds of which indeed were doubtless already deposited at a far earlier period.
The Greek authors of this age are full of descriptions of the unbounded luxury of Etruscan life: poets of Lower Italy in the fifth century of the city celebrate the Tyrrhenian wine, and the contemporary historians Timaeus and Theopompus delineate pictures of Etruscan unchastity and of Etruscan banquets, such as fall nothing short of the worst Byzantine or French demoralization. Unattested as may be the details in these accounts, the statement at least appears to be well founded, that the detestable amusement of gladiatorial combats--the gangrene of the later Rome and of the last epoch of antiquity generally--first came into vogue among the Etruscans.
At any rate on the whole they leave no doubt as to the deep degeneracy of the nation. It pervaded even its political condition. As far as our scanty information reaches, we find aristocratic tendencies prevailing, in the same way as they did at the same period in Rome, but more harshly and more perniciously. The abolition of royalty, which appears to have been carried out in all the cities of Etruria about the time of the siege of Veii, called into existence in the several cities a patrician government, which experienced but slight restraint from the laxity of the federal bond.
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Reference address : https://www.ellopos.net/elpenor/rome/2-04-fall-etruscan-celts.asp?pg=32