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
On the wide region beyond Ravenna as far as the Alps non-Italian peoples were settled. South of the Po the strong Celtic tribe of the Boii still held its ground (from Parma to Bologna); alongside of them, the Lingones on the east and the Anares on the west (in the region of Parma)--two smaller Celtic cantons presumably clients of the Boii-- peopled the plain. At the western end of the plain the Ligurians began, who, mingled with isolated Celtic tribes, and settled on the Apennines from above Arezzo and Pisa westward, occupied the region of the sources of the Po.
The eastern portion of the plain north of the Po, nearly from Verona to the coast, was possessed by the Veneti, a race different from the Celts and probably of Illyrian extraction. Between these and the western mountains were settled the Cenomani (about Brescia and Cremona) who rarely acted with the Celtic nation and were probably largely intermingled with Veneti, and the Insubres (around Milan).
The latter was the most considerable of the Celtic cantons in Italy, and was in constant communication not merely with the minor communities partly of Celtic, partly of non-Celtic extraction, that were scattered in the Alpine valleys, but also with the Celtic cantons beyond the Alps.
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Reference address : https://www.ellopos.net/elpenor/rome/3-03-extension-italy.asp?pg=27