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
To the south-east of these we meet with another Celtic stock, which made its appearance in Styria and Carinthia under the name of the Taurisci and afterwards of the Norici, in Friuli, Carniola, and Istria under that of the Carni. Their city Noreia (not far from St. Veit to the north of Klagenfurt) was flourishing and widely known from the iron mines that were even at that time zealously worked in those regions; still more were the Italians at this very period allured thither by the rich seams of gold brought to light, till the natives excluded them and took this California of that day wholly into their own hands.
These Celtic hordes streaming along on both sides of the Alps had after their fashion occupied chiefly the flat and hill country; the Alpine regions proper and likewise the districts along the Adige and the Lower Po were not occupied by them, and remained in the hands of the earlier indigenous population. Nothing certain has yet been ascertained as to the nationality of the latter; but they appear under the name of the Raeti in the mountains of East Switzerland and the Tyrol, and under that of the Euganei and Veneti about Padua and Venice; so that at this last point the two great Celtic streams almost touched each other, and only a narrow belt of native population separated the Celtic Cenomani about Brescia from the Celtic Carnians in Friuli.
The Euganei and Veneti had long been peaceful subjects of the Romans; whereas the peoples of the Alps proper were not only still free, but made regular forays down from their mountains into the plain between the Alps and the Po, where they were not content with levying contributions, but conducted themselves with fearful cruelty in the townships which they captured, not unfrequently slaughtering the whole male population down to the infant in the cradle--the practical answer, it may be presumed, to the Roman razzias in the Alpine valleys. How dangerous these Raetian inroads were, appears from the fact that one of them about 660 destroyed the considerable township of Comum.
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Reference address : https://www.ellopos.net/elpenor/rome/4-05-peoples-north.asp?pg=16