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 proceeded not so much from a party as from a number of malcontents without proper political aims or notable support, who had mainly undertaken to effect the recall of the exiles by legal or illegal means. Cinna seems to have been admitted into the conspiracy only by an afterthought and merely because the intrigue, which in consequence of the restriction of the tribunician powers needed a consul to bring forward its proposals, saw in him among the consular candidates for 667 its fittest instrument and so pushed him forward as consul.
Among the leaders appearing in the second rank of the movement were some abler heads; such was the tribune of the people Gnaeus Papirius Carbo, who had made himself a name by his impetuous popular eloquence, and above all Quintus Sertorius, one of the most talented of Roman officers and a man in every respect excellent, who since his candidature for the tribunate of the people had been a personal enemy to Sulla and had been led by this quarrel into the ranks of the disaffected to which he did not at all by nature belong. The proconsul Strabo, although at variance with the government, was yet far from going along with this faction.
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Reference address : https://www.ellopos.net/elpenor/rome/4-09-cinna-sulla.asp?pg=4