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
Insurrection of Lepidus
Yet all the more openly were arrangements thenceforth made to introduce a fresh revolution. Daily the Forum resounded with accusations against the "mock Romulus" and his executioners. Even before the great potentate had closed his eyes, the overthrow of the Sullan constitution, the re-establishment of the distributions of grain, the reinstating of the tribunes of the people in their former position, the recall of those who were banished contrary to law, the restoration of the confiscated lands, were openly indicated by Lepidus and his adherents as the objects at which they aimed. Now communications were entered into with the proscribed; Marcus Perpenna, governor of Sicily in the days of Cinna,(17) arrived in the capital.
17 Cf. IV. IX. The Provinces
The sons of those whom Sulla had declared guilty of treason--on whom the laws of the restoration bore with intolerable severity--and generally the more noted men of Marian views were invited to give their accession. Not a few, such as the young Lucius Cinna, joined the movement; others, however, followed the example of Gaius Caesar, who had returned home from Asia on receiving the accounts of the death of Sulla and of the plans of Lepidus, but after becoming more accurately acquainted with the character of the leader and of the movement prudently withdrew.
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Reference address : http://www.ellopos.net/elpenor/rome/5-01-lepidus-sertorius.asp?pg=32