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
Praetorship - Curule Aedileship - Complete Opening Up of Magistracies and Priesthoods
In like manner the aristocracy simply injured itself by the attempt which it made, on the passing of the Licinian laws, to save at least some remnant of its ancient privileges by means of a system of political clipping and paring. Under the pretext that the nobility were exclusively cognizant of law, the administration of justice was detached from the consulate when the latter had to be thrown open to the plebeians; and for this purpose there was nominated a special third consul, or, as he was commonly called, a praetor.
In like manner the supervision of the market and the judicial police-duties connected with it, as well as the celebration of the city-festival, were assigned to two newly nominated aediles, who--by way of distinction from the plebeian aediles--were named from their standing jurisdiction "aediles of the judgment seat" (-aediles curules-). But the curule aedileship became immediately so far accessible to the plebeians, that it was held by patricians and plebeians alternately.
Moreover the dictatorship was thrown open to plebeians in 398, as the mastership of the horse had already been in the year before the Licinian laws (386); both the censorships were thrown open in 403, and the praetorship in 417; and about the same time (415) the nobility were by law excluded from one of the censorships, as they had previously been from one of the consulships.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=20