Edited sentence: All Gaul is divided into 3 parts, one of which the Belgae inhabit, the Aquitani another, those who in their own language are called Celts, in ours(Latin) Gauls, the third.All these differ from each other in language, customs and laws.Caesar in his book The Gallic Wars, specifically mentions Gauls and Celts.It also gives us a clear view of the Geographic location of those who spoke Celt in "Gaul" at that time.The river Garonne separates the Gauls from the Aquitani; the Marne and the Seine separate them from the Belgae.There is no evidence that Pict was a Celtic language, and may have been aboriginal to Britain prior to the arrival of the speakers of Celtic.This clears up much confusion about the Etymology of the words Celt and Gaul.We know that the Aquitani were the Basques, and the Belgae were a Lower Germanic people(similar to Saxons/Freisians)