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
In this respect the Roman community was a genuine farmer-commonwealth, in which the rich holder of a whole hide was little distinguished externally from the poor cottager and held intercourse with him on equal terms, but aristocracy nevertheless exercised so all-powerful a sway that a man without means far sooner rose to be master of the burgesses in the city than mayor in his own village.
It was a very great and valuable gain, that under the new legislation even the poorest burgess might fill the highest office of the state; nevertheless it was a rare exception when a man from the lower ranks of the population reached such a position,(11) and not only so, but probably it was, at least towards the close of this period, possible only by means of an election carried by the opposition.
11. The statements as to the poverty of the consulars of this period, which play so great a part in the moral anecdote-books of a later age, mainly rest on a misunderstanding on the one hand of the old frugal economy--which might very well consist with considerable prosperity --and on the other hand of the beautiful old custom of burying men who had deserved well of the state from the proceeds of penny collections --which was far from being a pauper burial. The method also of explaining surnames by etymological guess-work, which has imported so many absurdities into Roman history, has furnished its quota to this belief (-Serranus-).
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=36