My Dad wrote an article about this 25 years ago or so: https://aoi.com.au/LB/LB705/ (How the Neanderthals became the Basques). He would really get a kick out of people reading it (he's 90 now). His website goes back to 96' and it shows.
Although one of the references goes to a now dead "reptilian agenda" website which might have been even more interesting:)
The thing loaded instantly. What a breath of fresh air in 2026. Hats off to Dad.