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
Plastic and Delineative Art
Like architectural art, and, if possible, still more completely, the plastic and delineative arts were not so much matured by Greek stimulus as developed from Greek seeds on Italian soil. We have already observed(38) that these, although only younger sisters of architecture, began to develop themselves at least in Etruria, even during the Roman regal period; but their principal development in Etruria, and still more in Latium, belongs to the present epoch, as is very evident from the fact that in those districts which the Celts and Samnites wrested from the Etruscans in the course of the fourth century there is scarcely a trace of the practice of Etruscan art.
38. Cf. I. XV. Plastic Art in Italy
The plastic art of the Tuscans applied itself first and chiefly to works in terra-cotta, in copper, and in gold-materials which were furnished to the artists by the rich strata of clay, the copper mines, and the commercial intercourse of Etruria. The vigour with which moulding in clay was prosecuted is attested by the immense number of bas-reliefs and statuary works in terra-cotta, with which the walls, gables, and roofs of the Etruscan temples were once decorated, as their still extant ruins show, and by the trade which can be shown to have existed in such articles from Etruria to Latium.
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Reference address : https://www.ellopos.net/elpenor/rome/2-09-art-science.asp?pg=40