For the most part most of the nobles in Spain today have Breton sentences for surnames!
For a variety of reasons most historians give the credit to '"French knights" ~ which simply wasn't the case.
Note, for a very long time the various kingdoms and principalities fronting the Bay of Biscay were what amounted to a regional super power. The differences from their life and that of the people further inland were stark. The modern nation states we know so well were for the most part pastoral or agricultural, peopled mostly by slaves or near slaves ruled over by a dissolute gang of drunken, brawling nobles of unsavory sexual hygiene and behavior.
Both of those views are news to me. I've always had the impression that the Reconquest was an off-and-on series of battles, fought over centuries, mostly by Spaniards. I see no evidence to the contrary in the Wikipedia account. Do you recall the names of historians who claim that the Spaniards were not responsible?