The Religion of the Ancient Celts
Broca assumed that the dark, brachycephalic people whom he
identified with Cæsar's "Celtæ," differed from the
Belgæ, were conquered by them, and acquired the language of
their conquerors, hence wrongly called Celtic by philologists. The
Belgæ were tall and fair, and overran Gaul, except Aquitaine,
mixing generally with the Celtæ, who in Cæsar's time
had thus an infusion of Belgic blood.