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
Even the patrician order proper were still at this epoch powerful enough to fill the second consulship and the second censorship, which stood open in law alike to patricians and plebeians, solely with men of their own body, the former up to the close of this period (till 582), the latter even for a generation longer (till 623); and in fact, at the most perilous moment which the Roman republic ever experienced --in the crisis after the battle of Cannae--they cancelled the quite legally conducted election of the officer who was in all respects the ablest--the plebeian Marcellus--to the consulship vacated by the death of the patrician Paullus, solely on account of his plebeianism.
At the same time it is a significant token of the nature even of this reform that the right of precedence in voting was withdrawn only from the nobility, not from those of the highest rating; the right of prior voting withdrawn from the equestrian centuries passed not to a division chosen incidentally by lot from the whole burgesses, but exclusively to the first class. This as well as the five grades generally remained as they were; only the lower limit was probably shifted in such a way that the minimum census was, for the right of voting in the centuries as for service in the legion, reduced from 11,000 to 4000 -asses-.
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Reference address : https://www.ellopos.net/elpenor/rome/3-11-government-governed.asp?pg=71