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 Democratic-Military Revolution
The Gabinio-Manilian proposals terminated the struggle between the senate and the popular party, which the Sempronian laws had begun sixty-seven years before. As the Sempronian laws first constituted the revolutionary party into a political opposition, the Gabinio- Manilian first converted it from an opposition into the government; and as it had been a great moment when the first breach in the existing constitution was made by disregarding the veto of Octavius, it was a moment no less full of significance when the last bulwark of the senatorial rule fell with the withdrawal of Trebellius.
This was felt on both sides and even the indolent souls of the senators were convulsively roused by this death- struggle; but yet the war as to the constitution terminated in a very different and far more pitiful fashion than it had begun. A youth in every sense noble had commenced the revolution; it was concluded by pert intriguers and demagogues of the lowest type. On the other hand, while the Optimates had begun the struggle with a measured resistance and with a defence which earnestly held out even at the forlorn posts, they ended with taking the initiative in club-law, with grandiloquent weakness, and with pitiful perjury.
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Reference address : https://www.ellopos.net/elpenor/rome/5-03-fall-oligarchy-pompeius.asp?pg=38