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
In this manner provision was made for the preponderance of the
freeholders in the comitia of the tribes, while for the centuriate
comitia in themselves the wealthy already turned the scale.
By this
wise and moderate arrangement on the part of a man who for his warlike
feats and still more for this peaceful achievement justly received the
surname of the Great (-Maximus-), on the one hand the duty of bearing
arms was extended, as was fitting, also to the non-freehold burgesses;
on the other hand care was taken that their influence, especially
that of those who had once been slaves and who were for the most part
without property in land, should be subjected to that check which
is unfortunately, in a state allowing slavery, an indispensable
necessity.
A peculiar moral jurisdiction, moreover, which gradually
came to be associated with the census and the making up of the
burgess-roll, excluded from the burgess-body all individuals
notoriously unworthy, and guarded the full moral and political
purity of citizenship.