an ancient region in Europe that corresponds to modern France, Belgium, the southern Netherlands, southwestern Germany, and northern Italy. The area south of the Alps was conquered in 222 bc by the Romans, who called it Cisalpine Gaul . The area north of the Alps, known as Transalpine Gaul , was taken by Julius Caesar between 58 and 51 bc.
a native or inhabitant of ancient Gaul.
He claimed that the former inhabitants of Britain were Celts or Gauls on the basis of similarity in ancient place-names in Gaul and Britain.