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 Etruscan Constitution
The Tuscan constitution, like the Greek and Latin, was based on the gradual transition of the community to an urban life. The early direction of the national energies towards navigation, trade, and manufactures appears to have called into existence urban commonwealths, in the strict sense of the term, earlier in Etruria than elsewhere in Italy. Caere is the first of all the Italian towns that is mentioned in Greek records.
On the other hand we find that the Etruscans had on the whole less of the ability and the disposition for war than the Romans and Sabellians: the un-Italian custom of employing mercenaries for fighting occurs among the Etruscans at a very early period. The oldest constitution of the communities must in its general outlines have resembled that of Rome. Kings or Lucumones ruled, possessing similar insignia and probably therefore a similar plenitude of power with the Roman kings.
A strict line of demarcation separated the nobles from the common people. The resemblance in the clan-organization is attested by the analogy of the system of names; only, among the Etruscans, descent on the mother's side received much more consideration than in Roman law. The constitution of their league appears to have been very lax. It did not embrace the whole nation; the northern and the Campanian Etruscans were associated in confederacies of their own, just in the same way as the communities of Etruria proper.
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Reference address : https://www.ellopos.net/elpenor/rome/1-09-etruscans.asp?pg=14