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 Senate under the Monarchy - Cicero and the Majority
The humbled senate had to submit to its position whether it would or not. The leader of the compliant majority continued to be Marcus Cicero. He was useful on account of his lawyer's talent of finding reasons, or at any rate words, for everything; and there was a genuine Caesarian irony in employing the man, by means of whom mainly the aristocracy had conducted their demonstrations against the regents, as the mouthpiece of servility. Accordingly they pardoned him for his brief desire to kick against the pricks, not however without having previously assured themselves of his submissiveness in every way.
His brother had been obliged to take the position of an officer in the Gallic army to answer in some measure as a hostage for him; Pompeius had compelled Cicero himself to accept a lieutenant-generalship under him, which furnished a handle for politely banishing him at any moment. Clodius had doubtless been instructed to leave him meanwhile at peace, but Caesar as little threw off Clodius on account of Cicero as he threw off Cicero on account of Clodius; and the great saviour of his country and the no less great hero of liberty entered into an antechamber-rivalry in the headquarters of Samarobriva, for the befitting illustration of which there lacked, unfortunately, a Roman Aristophanes.
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Reference address : https://www.ellopos.net/elpenor/rome/5-08-pompeius-caesar.asp?pg=35