https://en.wikipedia.org/wiki/Gallia_Belgica
WebGallia Belgica ("Belgic Gaul") was a province of the Roman Empire located in the north-eastern part of Roman Gaul, in what is today primarily northern France, Belgium, and Luxembourg, along with parts of the Netherlands and Germany.. In 50 BC, after the conquest by Julius Caesar during his Gallic Wars, it became one of the three parts of …