Note: The area of Roman Gaul bounded by the Alps, the Mediterranean, the Pyrenees, the Atlantic, and the Rhine. It included what is now France and Belgium, along with parts of Germany, the Netherlands, and Switzerland. The Romans first ventured into Transalpine Gaul in 121 BCE to subdue the Celtic tribes of the Mediterranean coast. Transalpine Gaul was annexed by Julius Caesar after the Gallic Wars (58-50 BCE). Augustus later divided it into four provinces: the senatorial province of Gallia Narbonensis and the three provinces of Gallia Comata: Gallia Belgica, Gallia Lugdunensis, and Gallia Aquitania.
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