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
Thereafter, when
the Greek cities of southern Italy, Neapolis leading the way in 428,
were admitted to the clientship of Rome, the war-vessels, which each
of these cities bound itself to furnish as a war contribution under
the alliance to the Romans, formed at least a renewed nucleus for a
Roman fleet. In 443, moreover, two fleet-masters (-duoviri navales-)
were nominated in consequence of a resolution of the burgesses
specially passed to that effect, and this Roman naval force
co-operated in the Samnite war at the siege of Nuceria.(20)
Perhaps
even the remarkable mission of a Roman fleet of twenty-five sail to
found a colony in Corsica, which Theophrastus mentions in his "History
of Plants" written about 446, belongs to this period. But how little
was immediately accomplished with all this preparation, is shown by
the renewed treaty with Carthage in 448.
