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
But notwithstanding these vexatious disabilities the privileges of the
clans, so far as they had a political value, were legally superseded
by the new institution; and, had the Roman nobility been worthy of its
name, it must now have given up the struggle. But it did not.
Though
a rational and legal resistance was thenceforth impossible, spiteful
opposition still found a wide field of petty expedients, of chicanery
and intrigue; and, far from honourable or politically prudent as such
resistance was, it was still in a certain sense fruitful of results.
It certainly procured at length for the commons concessions which
could not easily have been wrung from the united Roman aristocracy;
but it also prolonged civil war for another century and enabled
the nobility, in defiance of those laws, practically to retain the
government in their exclusive possession for several generations
longer.
