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
Among the conservatives he belonged
to the section of Crassus and Drusus. We do not know what primarily
gave occasion to his soliciting the tribuneship of the people for 666,
and on its account renouncing his patrician nobility; but he seems
to have been by no means rendered a revolutionist through the
fact that he, like the whole middle party, had been persecuted as
revolutionary by the conservatives, and to have by no means intended
an overthrow of the constitution in the sense of Gaius Gracchus.
It would rather seem that, as the only man of note belonging to
the party of Crassus and Drusus who had come forth uninjured from
the storm of the Varian prosecutions, he felt himself called on
to complete the work of Drusus and finally to set aside the still
subsisting disabilities of the new burgesses--for which purpose he
needed the tribunate. Several acts of his even during his tribuneship
are mentioned, which betray the very opposite of demagogic designs.
