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
It is more than probable--especially on account of the altogether different character of the tombs in the unique Praeneste--that in this result we have to recognize the influence of the stern Roman morality or--if the expression be preferred--of the rigid Roman police.
Closely connected with this subject are the already-mentioned interdicts, which the law of the Twelve Tables fulminated against purple bier-cloths and gold ornaments placed beside the dead; and the banishment of all silver plate, excepting the salt-cellar and sacrificial ladle, from the Roman household, so far at least as sumptuary laws and the terror of censorial censure could banish it: even in architecture we shall again encounter the same spirit of hostility to luxury whether noble or ignoble.
Although, however, in consequence of these influences Rome probably preserved a certain outward simplicity longer than Capua and Volsinii, her commerce and trade--on which, in fact, along with agriculture her prosperity from the beginning rested--must not be regarded as having been inconsiderable, or as having less sensibly experienced the influence of her new commanding position.
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Reference address : https://www.ellopos.net/elpenor/rome/2-08-law-religion-army-economy-nationality.asp?pg=32