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 Conspirators in Rome
Catilina was in a painful position. According to his design there should have been a simultaneous rising in the capital and in Etruria on occasion of the consular elections; the failure of the former and the outbreak of the latter movement endangered his person as well as the whole success of his undertaking. Now that his partisans at Faesulae had once risen in arms against the government, he could no longer remain in the capital; and yet not only did everything depend on his inducing the conspirators of the capital now at least to strike quickly, but this had to be done even before he left Rome--for he knew his helpmates too well to rely on them for that matter.
The more considerable of the conspirators--Publius Lentulus Sura consul in 683, afterwards expelled from the senate and now, in order to get back into the senate, praetor for the second time, and the two former praetors Publius Autronius and Lucius Cassius--were incapable men; Lentulus an ordinary aristocrat of big words and great pretensions, but slow in conception and irresolute in action; Autronius distinguished for nothing but his powerful screaming voice; while as to Lucius Cassius no one comprehended how a man so corpulent and so simple had fallen among the conspirators.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=31