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 Parties in Relation to the Gabinian Laws
The democracy, discontented as its leaders might be in secret, could not well come publicly forward against the project of law. It would, to all appearance, have been in no case able to hinder the carrying of the law; but it would by opposition have openly broken with Pompeius and thereby compelled him either to make approaches to the oligarchy or regardlessly to pursue his personal policy in the face of both parties. No course was left to the democrats but still even now to adhere to their alliance with Pompeius, hollow as it was, and to embrace the present opportunity of at least definitely overthrowing the senate and passing over from opposition into government, leaving the ulterior issue to the future and to the well-known weakness of Pompeius' character. Accordingly their leaders--the praetor Lucius Quinctius, the same who seven years before had exerted himself for the restoration of the tribunician power,(11) and the former quaestor Gaius Caesar-- supported the Gabinian proposals.
11. Cf. V. III. Attempts to Restore the Tribunician Power
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=31