Sincerely John know much more than me about Medieval History....my specialiy is WW1 (1914-1918) Spanish Empire (1492-1976) and Almogávares... So, John know better medieval history.Saqaliba were mentioned, enslaved slavic ppl who lived in the islamic territories incl Iberian peninsula and perhaps they played certain role in ethnogenesis of Moriscos. I am not expert on the issue, John and Martin are, so i kindly ask, could you please share your knowledge about who saqaliba were, how many were they etc.
About Spaniards I just read in 2019 analizys.. Modern spaniards settled in Peninsula around 3.500 years ago.. and they came from Galitzia (today Poland-Ukrainia) walking through Europe. Yes I know some muslims in Spain were "eslavos" (slaves).. people from slavonic languages.. Bulgarian, Yugoslavian, etc.. I guess russian, poles, ukrainian too..
here (Spanish) about Slavic Slaves and Slavic Taifas in Spain
The Slavic were fully islamized after few generations and they were also general, soldiers and governors.. in Almeria, Balearic Islands and Valencia there were Slavic taifas.
Slavic were named "saqaliba".. and most of them were blonde hair (Francisco de Asis Veas Arteseros.” La civilización andalusi”.En Historia de Espana. Edad Media. Vicente Angel Alvarez Valenzuela (Coord.). Ed. Ariel. Barcelona. 2005 p. 210). .. it is because I think from Ukrainia-Poland-Russia.... in Balkan most of slavic people are dark hair (Yugoslavian, bulgarian etc).
Slavic people achieved highest position in Islamic administration... and also the lowest. But Slavic mercenaries and palatine slaves will become indispensable and end up replacing the reigning dynasties
Slavic were some kings as Abd-al-Aziz ben Abd-al-Rahman (king of Valencia from 1021 to 1061) or Abd-al-Malik (King from 1061 to 1085). Also Muhayib I (King of Denia and Balearic Islands) was another slavic king.