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
A patrician matron, who was married to a leading plebeian that had attained to the highest dignities of the state, was on account of this misalliance expelled from the circle of noble dames and was refused admission to the common festival of Chastity; and in consequence of that exclusion separate patrician and plebeian goddesses of Chastity were thenceforward worshipped in Rome.
Doubtless caprices of this sort were of very little moment, and the better portion of the clans kept themselves entirely aloof from this miserable policy of peevishness; but it left behind on both sides a feeling of discontent, and, while the struggle of the commons against the clans was in itself a political and even moral necessity, these convulsive efforts to prolong the strife--the aimless combats of the rear-guard after the battle had been decided, as well as the empty squabbles as to rank and standing--needlessly irritated and disturbed the public and private life of the Roman community.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=25