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
Attempt at Reform on the Part of the Moderate Party
Drusus drew up a proposal to withdraw the functions of jurymen from the burgesses of equestrian rating and to restore them to the senate, which at the same time was to be put in a position to meet its increased obligations by the admission of 300 new members; a special criminal commission was to be appointed for pronouncing judgment in the case of those jurymen who had been or should be guilty of accepting bribes. By this means the immediate object was gained; the capitalists were deprived of their political exclusive rights, and were rendered responsible for the perpetration of injustice.
But the proposals and designs of Drusus were by no means limited to this; his projects were not measures adapted merely for the occasion, but a comprehensive and thoroughly-considered plan of reform. He proposed, moreover, to increase the largesses of grain and to cover the increased expense by the permanent issue of a proportional number of copper plated, alongside of the silver, -denarii-; and then to set apart all the still undistributed arable land of Italy--thus including in particular the Campanian domains--and the best part of Sicily for the settlement of burgess-colonists.
Lastly, he entered into the most distinct obligations towards the Italian allies to procure for them the Roman franchise. Thus the very same supports of power and the very same ideas of reform, on which the constitution of Gaius Gracchus had rested, presented themselves now on the side of the aristocracy--a singular, and yet easily intelligible coincidence.
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Reference address : https://www.ellopos.net/elpenor/rome/4-06-marius-revolution-drusus-reform.asp?pg=45