Cisalpine Gaul was a region in ancient northern Italy, located south of the Alps. It was inhabited by various Celtic tribes and became part of the Roman Republic in the 2nd century BCE. The area was known for its fertile land and strategic importance, serving as a bridge between Rome and the northern territories. The region was divided into several provinces, including Gallia Transpadana and Gallia Cispadana. Cisalpine Gaul played a significant role in the expansion of Roman influence in the area, leading to the establishment of Roman cities and infrastructure, which helped integrate it into the Roman Empire.