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
Religion of the Etruscans
But the remains of the sacred ritual of the Etruscans that have reached us are marked by a different spirit. Their prevailing characteristics are a gloomy and withal tiresome mysticism, ringing the changes on numbers, soothsaying, and that solemn enthroning of pure absurdity which at all times finds its own circle of devotees. We are far from knowing the Etruscan worship in such completeness and purity as we know the Latin; and it is not improbable--indeed it cannot well be doubted--that several of its features were only imported into it by the minute subtlety of a later period, and that the gloomy and fantastic principles, which were most alien to the Latin worship, are those that have been especially handed down to us by tradition. But enough still remains to show that the mysticism and barbarism of this worship had their foundation in the essential character of the Etruscan people.
With our very unsatisfactory knowledge we cannot grasp the intrinsic contrast subsisting between the Etruscan conceptions of deity and the Italian; but it is clear that the most prominent among the Etruscan gods were the malignant and the mischievous; as indeed their worship was cruel, and included in particular the sacrifice of their captives; thus at Caere they slaughtered the Phocaean, and at Traquinii the Roman, prisoners. Instead of a tranquil world of departed "good spirits" ruling peacefully in the realms beneath, such as the Latins had conceived, the Etruscan religion presented a veritable hell, in which the poor souls were doomed to be tortured by mallets and serpents, and to which they were conveyed by the conductor of the dead, a savage semi-brutal figure of an old man with wings and a large hammer--a figure which afterwards served in the gladiatorial games at Rome as a model for the costume of the man who removed the corpses of the slain from the arena.
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Reference address : https://www.ellopos.net/elpenor/rome/1-12-religion.asp?pg=34