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
Every aristocratic government of itself calls forth a corresponding opposition party; and as the formal equalization of the orders only modified the aristocracy, and the new ruling order not only succeeded the old patriciate but engrafted itself on it and intimately coalesced with it, the opposition also continued to exist and in all respects pursued a similar course.
As it was now no longer the plebeian burgesses as such, but the common people, that were treated as inferior, the new opposition professed from the first to be the representative of the lower classes and particularly of the small farmers; and as the new aristocracy attached itself to the patriciate, so the first movements of this new opposition were interwoven with the final struggles against the privileges of the patricians.
The first names in the series of these new Roman popular leaders were Manius Curius (consul 464, 479, 480; censor 481) and Gaius Fabricius (consul 472, 476, 481; censor 479); both of them men without ancestral lineage and without wealth, both summoned--in opposition to the aristocratic principle of restricting re-election to the highest office of the state--thrice by the votes of the burgesses to the chief magistracy, both, as tribunes, consuls, and censors, opponents of patrician privileges and defenders of the small farmer-class against the incipient arrogance of the leading houses.
The future parties were already marked out; but the interests of party were still suspended on both sides in presence of the interests of the commonweal. The patrician Appius Claudius and the farmer Manius Curius--vehement in their personal antagonism--jointly by wise counsel and vigorous action conquered king Pyrrhus; and while Gaius Fabricius as censor inflicted penalties on Publius Cornelius Rufinus for his aristocratic sentiments and aristocratic habits, this did not prevent him from supporting the claim of Rufinus to a second consulate on account of his recognized ability as a general. The breach was already formed; but the adversaries still shook hands across it.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=37