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
Still more important than these individual accessions was the gain of the district of Picenum, which was substantially due to the son of Strabo, the young Gnaeus Pompeius. The latter, like his father originally no adherent of the oligarchy, had acknowledged the revolutionary government and even taken service in Cinna's army; but in his case the fact was not forgotten, that his father had borne arms against the revolution; he found himself assailed in various forms and even threatened with the loss of his very considerable wealth by an indictment charging him to give up the booty which was, or was alleged to have been, embezzled by his father after the capture of Asculum.
The protection of the consul Carbo, who was personally attached to him, still more than the eloquence of the consular Lucius Philippus and of the young Quintus Hortensius, averted from him financial ruin; but the dissatisfaction remained. On the news of Sulla's landing he went to Picenum, where he had extensive possessions and the best municipal connections derived from his father and the Social war, and set up the standard of the Optimate party in Auximum (Osimo).
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=33