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 Equestrian Party
Still more important in its consequences than the setting aside of the dangerous man was the deep exasperation against the Populares, as they were called, which the insurrection of Saturninus left behind in the party of material interests. With the most remorseless severity the equestrian tribunals condemned every one who professed oppositional views; Sextus Titius, for instance, was condemned not so much on account of his agrarian law as because he had in his house a statue of Saturninus; Gaius Appuleius Decianus was condemned, because he had as tribune of the people characterized the proceedings against Saturninus as illegal.
Even for earlier injuries inflicted by the Populares on the aristocracy satisfaction was now demanded, not without prospect of success, before the equestrian tribunals. Because Gaius Norbanus had eight years previously in concert with Saturninus driven the consular Quintus Caepio into exile(10) he was now (659) on the ground of his own law accused of high treason, and the jurymen hesitated long--not whether the accused was guilty or innocent, but whether his ally Saturninus or his enemy Caepio was to be regarded as the most deserving of their hate--till at last they decided for acquittal.
10. Cf. IV. V. Warfare of Prosecutions
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=35