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
The tendency of these enactments is obvious. They were designed to deprive the nobles of their exclusive possession of the curule magistracies and of the hereditary distinctions of nobility therewith associated; which, it was characteristically conceived, could only be accomplished by the legal exclusion of the nobles from the place of second consul.
They were designed, as a consequence, to emancipate the plebeian members of the senate from the subordinate position which they occupied as silent by-sitters,(7) in so far as those of them at least who had filled the consulate thereby acquired a title to deliver their opinion with the patrician consulars before the other patrician senators.(8)
7. Cf. II. I. Senate,
8. Cf. II. I. Senate, II. III. Opposition of the Patriciate
They were intended, moreover, to withdraw from the nobles the exclusive possession of spiritual dignities; and in carrying out this purpose for reasons sufficiently obvious the old Latin priesthoods of the augurs and Pontifices were left to the old burgesses, but these were obliged to open up to the new burgesses the third great college of more recent origin and belonging to a worship that was originally foreign.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=17