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 people, or Ras,(1) as they called themselves, present a most striking contrast to the Latin and Sabellian Italians as well as to the Greeks.
1. -Ras-ennac-, with the gentile termination mentioned below.
They were distinguished from these nations by their very bodily structure: instead of the slender and symmetrical proportions of the Greeks and Italians, the sculptures of the Etruscans exhibit only short sturdy figures with large head and thick arms. Their manners and customs also, so far as we are acquainted with them, point to a deep and original diversity from the Graeco-Italian stocks.
The religion of the Tuscans in particular, presenting a gloomy fantastic character and delighting in the mystical handling of numbers and in wild and horrible speculations and practices, is equally remote from the clear rationalism of the Romans and the genial image-worship of the Greeks.
The conclusion which these facts suggest is confirmed by the most important and authoritative evidence of nationality, the evidence of language. The remains of the Etruscan tongue which have reached us, numerous as they are and presenting as they do various data to aid in deciphering it, occupy a position of isolation so complete, that not only has no one hitherto succeeded in interpreting these remains, but no one has been able even to determine precisely the place of Etruscan in the classification of languages.
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Reference address : https://www.ellopos.net/elpenor/rome/1-09-etruscans.asp