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 rejection of the Fulvian law in 629, and the insurrection of the Fregellans arising out of it, were significant indications both of the obstinate perseverance of the fraction of the burgesses that ruled the comitia, and of the impatient urgency of the allies. Towards the end of his second tribunate (632) Gracchus, probably urged by obligations which he had undertaken towards the allies, ventured on a second attempt. In concert with Marcus Flaccus--who, although a consular, had again taken the tribuneship of the people, in order now to carry the law which he had formerly proposed without success--he made a proposal to grant to the Latins the full franchise, and to the other Italian allies the former rights of the Latins.
But the proposal encountered the united opposition of the senate and the mob of the capital. The nature of this coalition and its mode of conflict are clearly and distinctly seen from an accidentally preserved fragment of the speech which the consul Gaius Fannius made to the burgesses in opposition to the proposal. "Do you then think," said the Optimate, "that, if you confer the franchise on the Latins, you will be able to find a place in future--just as you are now standing there in front of me--in the burgess-assembly, or at the games and popular amusements?
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=41