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
Total Destruction of the Democratic Party
For five years Pompeius stood at the head of his armies and fleets in the east; for five years the democracy at home conspired to overthrow him. The result was discouraging. With unspeakable exertions they had not merely attained nothing, but had suffered morally as well as materially enormous loss. Even the coalition of 683 could not but be for democrats of pure water a scandal, although the democracy at that time only coalesced with two distinguished men of the opposite party and bound these to its programme.
But now the democratic party had made common cause with a band of murderers and bankrupts, who were almost all likewise deserters from the camp of the aristocracy; and had at least for the time being accepted their programme, that is to say, the terrorism of Cinna. The party of material interests, one of the chief elements of the coalition of 683, was thereby estranged from the democracy, and driven into the arms of the Optimates in the first instance, or of any power at all which would and could give protection against anarchy. Even the multitude of the capital, who, although having no objection to a street-riot, found it inconvenient to have their houses set on fire over their heads, became in some measure alarmed.
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Reference address : https://www.ellopos.net/elpenor/rome/5-05-parties-pompeius.asp?pg=47