an ancient region in W Europe, including the modern areas of N Italy, France, Belgium, and the S Netherlands: consisted of two main divisions, one part S of the Alps (Cisalpine Gaul) and another part N of the Alps (Transalpine Gaul)
Latin Gallia. a province of the ancient Roman Empire, including the territory corresponding to modern France, Belgium, the S Netherlands, Switzerland, N Italy, and Germany W of the Rhine.
Thus, many celts were displaced in aquitania or were enslaved and moved out of Gaul.
British Dictionary definitions for Gaul
an ancient region of W Europe corresponding to N Italy, France, Belgium, part of Germany, and the S Netherlands: divided into Cisalpine Gaul, which became a Roman province before 100 bc, and Transalpine Gaul, which was conquered by Julius Caesar (58–51 bc) Latin name Gallia