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
Those who did so were chiefly the Boii, who are
alleged to have penetrated into Italy by another route, over the
Poenine Alps (the Great St. Bernard): they settled in the modern
Romagna, where the old Etruscan town Felsina, with its name changed
by its new masters to Bononia, became their capital. Finally came
the Senones, the last of the larger Celtic tribes which made their
way over the Alps; they took up their abode along the coast of the
Adriatic from Rimini to Ancona.
But isolated bands of Celtic settlers
must have advanced even far in the direction of Umbria, and up to
the border of Etruria proper; for stone-inscriptions in the Celtic
language have been found even at Todi on the upper Tiber. The limits
of Etruria on the north and east became more and more contracted,
and about the middle of the fourth century the Tuscan nation found
themselves substantially restricted to the territory which thenceforth
bore and still bears their name.
