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
Equivalence of Law and Plebiscitum
The two hundred years' strife was brought at length to: a close by the law of the dictator Q. Hortensius (465, 468) which was occasioned by a dangerous popular insurrection, and which declared that the decrees of the plebs should stand on an absolute footing of equality--instead of their earlier conditional equivalence--with those of the whole community.
So greatly had the state of things been changed that that portion of the burgesses which had once possessed exclusively the right of voting was thenceforth, under the usual form of taking votes binding for the whole burgess-body, no longer so much as asked the question.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=23