Between the Neolithic and the Iron Age, the original inhabitants of this part of the Italian peninsula were the Ligures. The Ligures living in this area of the Po river plain belonged specifically to the Taurini tribe. Sometime around 400 BCE, Celtic tribes crossed the Alps from Gaul and settled the Po river plain. These peoples mingled with the original Ligures, either through conquest or peaceful cohabitation, and gave rise to a Celto-Ligurian race of people, inhabiting the region which the Romans would call Cisalpine Gaul, i.e. "Gaul this side of the Alps".