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 expedients of which the nobility availed themselves were as various as political paltriness could suggest. Instead of deciding at once the question as to the admission or exclusion of the plebeians at the elections, they conceded what they were compelled to concede only with reference to the elections immediately impending.
The vain struggle was thus annually renewed whether patrician consuls or military tribunes from both orders with consular powers should be nominated; and among the weapons of the aristocracy this mode of conquering an opponent by wearying and annoying him proved by no means the least effective.
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Reference address : http://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=7