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
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The extensive assignations of land in 522 had already filled the whole territory between Ancona and Ariminum with Roman colonists, who settled here without communal organization in market-villages and hamlets. Further measures of the same character were taken, and it was not difficult to dislodge and extirpate a half-barbarous population like the Celtic, only partially following agriculture, and destitute of walled towns.
The great northern highway, which had been, probably some eighty years earlier, carried by way of Otricoli to Narni, and had shortly before been prolonged to the newly-founded fortress of Spoletium (514), was now (534) carried, under the name of the "Flaminian" road, by way of the newly-established market-village Forum Flaminii (near Foligno), through the pass of Furlo to the coast, and thence along the latter from Fanum (Fano) to Ariminum; it was the first artificial road which crossed the Apennines and connected the two Italian seas.
Great zeal was manifested in covering the newly- acquired fertile territory with Roman townships. Already, to cover the passage of the Po, the strong fortress of Placentia (Piacenza) had been founded on the right bank; not far from it Cremona had been laid out on the left bank, and the building of the walls of Mutina (Modena), in the territory taken away from the Boii, had far advanced --already preparations were being made for further assignations of land and for continuing the highway, when sudden event interrupted the Romans in reaping the fruit of their successes.
Do you see any typos or other mistakes? Please let us know and correct them
Reference address : https://www.ellopos.net/elpenor/rome/3-03-extension-italy.asp?pg=39