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 Opponents of the Future Monarchy
This goal, it is true, was not to be reached without a struggle. The constitution, which had endured for five hundred years, and under which the insignificant town on the Tiber had risen to unprecedented greatness and glory, had sunk its roots into the soil to a depth beyond human ken, and no one could at all calculate to what extent the attempt to overthrow it would penetrate and convulse civil society. Several rivals had been outrun by Pompeius in the race towards the great goal, but had not been wholly set aside. It was not at all beyond reach of calculation that all these elements might combine to overthrow the new holder of power, and that Pompeius might find Quintus Catulus and Marcus Cato united in opposition to him with Marcus Crassus, Gaius Caesar, and Titus Labienus.
But the inevitable and undoubtedly serious struggle could not well be undertaken under circumstances more favourable. It was in a high degree probable that, under the fresh impression of the Catilinarian revolt, a rule which promised order and security, although at the price of freedom, would receive the submission of the whole middle party--embracing especially the merchants who concerned themselves only about their material interests, but including also a great part of the aristocracy, which, disorganized in itself and politically hopeless, had to rest content with securing for itself riches, rank, and influence by a timely compromise with the prince; perhaps even a portion of the democracy, so sorely smitten by the recent blows, might submit to hope for the realization of a portion of its demands from a military chief raised to power by itself.
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Reference address : https://www.ellopos.net/elpenor/rome/5-06-pompeius-coalition-pretenders.asp?pg=2