The Celts are not descendants of Basque-related peoples. The Celts overthrew them.
There is something funny about this entire history: the original inhabitants are Basque-related 'pre-Celtic' peoples, who were overrun by Celts, who were themselves conquered by and mixed with Romans, who were subsequently overran by Germanic tribes, who settled in different numbers in different areas.
The fun is, that is the basic etno-historical story of both France and of the isle of Britain. Yet whereas the British attribute fair skin to the Germanic component, in France it is the Celtic component that is associated with blue eyes, while the Germanic component is downplayed a bit.
A nationalist Frenchman thinks himself a Celtic 'Gaul', the way a nationalist Englishman thinks himself a Germanic 'Anglo-Saxon'.
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