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
Moreover, the towns laid out by Rome in the interior of Italy began
towards the close of this period to receive instead of Latin rights
the full franchise, which previously had only been given to the
maritime colonies; and the enlargement of the Latin body by the
accession of new communities, which hitherto had gone on so regularly,
thus came to an end.
Aquileia, the establishment of which began in
571, was the latest of the Italian colonies of Rome that received
Latin rights; the full franchise was given to the colonies, sent forth
nearly at the same time, of Potentia, Pisaurum, Mutina, Parma, and
Luna (570-577). The reason for this evidently lay in the decline of
the Latin as compared with the Roman franchise.
The colonists
conducted to the new settlements were always, and now more than ever,
chosen in preponderating number from the Roman burgesses; and even
among the poorer portion of these there was a lack of people willing,
for the sake even of acquiring considerable material advantages, to
exchange their rights as burgesses for those of the Latin franchise.