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
Prosecutions of the Democrats
At first the reaction was mainly directed against persons. Publius Popillius was recalled from banishment after the enactments relating to him had been cancelled (633), and a warfare of prosecution was waged against the adherents of Gracchus; whereas the attempt of the popular party to have Lucius Opimius after his resignation of office condemned for high treason was frustrated by the partisans of the government (634). The character of this government of the restoration is significantly indicated by the progress of the aristocracy in soundness of sentiment. Gaius Carbo, once the ally of the Gracchi, had for long been a convert,(1) and had but recently shown his zeal and his usefulness as defender of Opimius.
1. Cf. IV. III. Democratic Agitation under Carbo and Flaccus
But he remained the renegade; when the same accusation was raised against him by the democrats as against Opimius, the government were not unwilling to let him fall, and Carbo, seeing himself lost between the two parties, died by his own hand. Thus the men of the reaction showed themselves in personal questions pure aristocrats.
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Reference address : https://www.ellopos.net/elpenor/rome/4-04-rule-restoration.asp?pg=3