Gallia Cisalpina

Roman province in the area of northern Italy between the Apennines and the Alps. It was settled by Celtic tribes. Rome conquered the Celts between 224 and 220 BCE, extending its northeastern frontier to the Julian Alps. When Hannibal invaded Italy in 218 BCE, the Celts joined his forces, and Rome lost this territory. It was recovered, however, between 198 and 191 BCE. It was incorporated into Italy in 42 BCE.