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
On the other hand there emerged a new class in a position of
peculiar inferiority, without communal freedom and the right to
carry arms, and, in part, treated almost like public slaves
(-peregrini dediticii-); to which, in particular, the members of
the former Campanian, southern Picentine, and Bruttian communities,
that had been in alliance with Hannibal,(25) belonged.
To these were
added the Celtic tribes tolerated on the south side of the Alps, whose
position in relation to the Italian confederacy is indeed only known
imperfectly, but is sufficiently characterized as inferior by the
clause embodied in their treaties of alliance with Rome, that no
member of these communities should ever be allowed to acquire
Roman citizenship.(26)