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
It is remarkable that in this very year (691) the full re-establishment of the Sempronian corn-largesses took place, and was effected by the senate on the proposal of Cato. The league of the democratic leaders with anarchy had obviously created a breach between the former and the burgesses of the city; and the oligarchy sought, not without at least momentary success, to enlarge this chasm and to draw over the masses to their side. Lastly, Gnaeus Pompeius had been partly warned, partly exasperated, by all these cabals; after all that had occurred, and after the democracy had itself virtually torn asunder the ties which connected it with Pompeius, it could no longer with propriety make the request-- which in 684 had had a certain amount of reason on its side-- that he should not himself destroy with the sword the democratic power which he had raised, and which had raised him.
Thus the democracy was disgraced and weakened; but above all it had become ridiculous through the merciless exposure of its perplexity and weakness. Where the humiliation of the overthrown government and similar matters of little moment were concerned, it was great and potent; but every one of its attempts to attain a real political success had proved a downright failure. Its relation to Pompeius was as false as pitiful. While it was loading him with panegyrics and demonstrations of homage, it was concocting against him one intrigue after another; and one after another, like soap-bubbles, they burst of themselves.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=48