Reto

The Salassi were a Celtic or Celticized Italic or Ligurian tribe whose lands lay on the Italian side of the Little St Bernard Pass across the Graian Alps to Lyons, and the Great St Bernard Pass over the Pennine Alps. The Romans finally defeated and enslaved many of them in 25 BCE, and founded the city of Augusta Praetoria Salassorum, modern Aosta, in their territory.

The end for the Salassi came swiftly:

For their last decade of freedom the Salassi (with some other, mainly Alpine, tribes subjugated by 14 BCE) were almost the only remaining groups not under Roman control in the Mediterranean basin. After the Battle of Actium in 31 BCE the Roman world was united under one ruler, Augustus, who could concentrate Roman forces against remaining holdouts. The end of independence for the Salassi came at the hands of Aulus Terentius Varro Murena in 25 BCE. Strabo records that two thousand Salassi were killed and all the survivors, nearly 40,000 men, women, and children, were taken to Eporedia and sold into slavery.

40'000 Salassis, the whole remaining tribe was sold into slavery by the Romans! Imagine if we as Switzerland would go and conquer Lichtenstein and sell all the people to our fellow Swiss as slaves. That's just what the Romans were doing then.

Wikipedia Link from where I quoted: https://en.wikipedia.org/wiki/Salassi