"Gaul is divided into three parts, one of which the Belgae inhabit, the Aquitani another, those who in their own language are called Celts, in our [Latin] language Gauls the third. All these differ from each other in language, customs and laws. The River Garonne separates the Gauls from the Aquitani, the Marne and the Seine separates them from the Belgae. Of all these the most powerful are the Belgae."