Basques repopulated Spain during the Reconquista


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Nowadays R1b is very common is Spain, like 70-75%. And it's domestic(Basque origin) downstream DF-27 makes like 40%.

But here's the thing, during al-Andalus times most haplogroups were Berber/Arabic. So we have to assume a population substitution.
We have to take into account that war is very normal and events and conquests that we summarize a lot, actually take centuries to develop, so there's plenty of room for genocide in large scale.

Something that left me wandering: What is the point to even ask what is the amount of Roman or Celtic DNA?
If the most likely explanation is that today we only see a handful of the lineages that once existed.

Hardly surprising for someone who studies population genetics and its history.
Diverse northern Spain populations reppopulated Spain (and Portugal) after the Muslim go back. It's true that Andalusia received an heavy input from peri-Basque Castillans who surely had some Basque input or at least strong deep common ancestry. Some survey about Iberia showed that, the dropping "down" (southwards) of Galicians, Leonese/N-Castillans and Catalans heritages.
How do we know this?

I saw a map on Carlos Quiles site. He has a database of Ancient DNA, and he produced a graph that in Murcia(near Almeria, where El Argar is) in the Middle Ages like 75% of Y-DNA was Saharian/Arabic
Basques didn�t repopulate Western Iberia at all.

Galicia repopulated that.
Instead for a substantial minority of the Muslims/Jews that were converted and stayed in Spain.

In Galicia there was an internal migration of "berbers" the genetic data suggests.
This Quiles text from Maciamo?) is based on small samples and doesn't tell us the precise subclades of Y-E involved for the first period, nor it tells us the precise social background of the remains studied (dominant Muslim chiefs or dominated Mozarabs of European origin).
So, yes, North-African, Arabic or even Saharian haplogroups, sure! But what were their weight in the allover population under their controle?
More like Northern Spaniards. Basques were the first to take family names, although only the Merino or tribal chief of every village. He would take the name of the village as a way of showing he was the primus cives (first citizen) of that town.
Well depends on where in the Peninsula. But yes, more like the other northern Spanish and Portuguese-Galician, Castillian, and Cantabrian populations. The repoblacion was a huge event throughout the peninsula. We know now from recent studies that the peninsula is formed in clusters of more homogenis dna profiles. For example North Portugal and south Portugal are virtually the same in autosomal DNA levels, and Galicia is not very different either being in the western cluster. In areas like Huelva in Andalucia the DNA is very similar to Castille y Leon, and the east part is similar to Catalan. Generally, the more west you go, the more North African DNA is found, the more east you go the less. But there is some small variations with more northern areas in clusters having less small outlier dna, but it's not that significant to separate them from their southern counterparts in similar longitudes.


on a similar note... this homogenity in iberian DNA was stable for a long time, before the repoblacion even happened. We know these ancient populations weren't all that different at one time (similar to iron age basques) but the shift in the roman era, and moorish era pushed clusters into east-west structures.

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