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 communities between the Alps and the Po were likewise discontented with the partial concessions made to them, and the new burgesses and freedmen were exasperated by the cancelling of the Sulpician laws. The populace of the city suffered amid the general distress, and found it intolerable that the government of the sabre was no longer disposed to acquiesce in the constitutional rule of the bludgeon.
The adherents, resident in the capital, of those outlawed after the Sulpician revolution-- adherents who remained very numerous in consequence of the remarkable moderation of Sulla--laboured zealously to procure permission for the outlaws to return home; and in particular some ladies of wealth and distinction spared for this purpose neither trouble nor money.
None of these grounds of ill-humour were such as to furnish any immediate prospect of a fresh violent collision between the parties; they were in great part of an aimless and temporary nature; but they all fed the general discontent, and had already been more or less concerned in producing the murder of Rufus, the repeated attempts to assassinate Sulla, the issue of the consular and tribunician elections for 667 partly in favour of the opposition.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=2