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 Later Patricianism
The struggle between the Roman clans and commons was thus substantially at an end. While the nobility still preserved out of its comprehensive privileges the -de facto- possession of one of the consulships and one of the censorships, it was excluded by law from the tribunate, the plebeian aedileship, the second consulship and censorship, and from participation in the votes of the plebs which were legally equivalent to votes of the whole body of burgesses.
As a righteous retribution for its perverse and stubborn resistance, the patriciate had seen its former privileges converted into so many disabilities. The Roman clan-nobility, however, by no means disappeared because it had become an empty name. The less the significance and power of the nobility, the more purely and exclusively the patrician spirit developed itself. The haughtiness of the "Ramnians" survived the last of their class-privileges for centuries; after they had steadfastly striven "to rescue the consulate from the plebeian filth" and had at length become reluctantly convinced of the impossibility of such an achievement, they continued at least rudely and spitefully to display their aristocratic spirit.
To understand rightly the history of Rome in the fifth and sixth centuries, we must never overlook this sulking patricianism; it could indeed do little more than irritate itself and others, but this it did to the best of its ability. Some years after the passing of the Ogulnian law (458) a characteristic instance of this sort occurred.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=24