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The origins of this city on the river track to Bolzano and the low Alpine passes of Brenner and the Reschen Pass over the Alps are disputed.

Some scholars maintain it was a Rhaetian settlement: the Adige area was however influenced by neighbouring populations, including the ( Adriatic ) Veneti, the Etruscans, the Cimbri, and the Gauls ( a Celtic people ).

According to other theories, the latter did instead found the city during the fourth century BC.