A) No, "Mauritania" simply was not existing in Roman times. Mauritania was what today is the Maghreb. This map shows the Roman province of Mauritania, which equals the main part of Algeria and the northern part of Morocco of today :
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[](http://fr.wikipedia.org/wiki/Fichier:Mauretania_et_Numidia.jpg) [](http://fr.wikipedia.org/wiki/Fichier:Mauretania_et_Numidia.jpg)
Maurétanie Tingitane (à l'ouest) [orange], Maurétanie Césarienne (au centre-ouest) [orange], Numidie (au centre-est) [rose], et Africa (à l'est) [rose]
B) No, the soldiers of the Ummayad armies were from areas in what are Syria, Lebanon, Palestine, Egypt, Tunisia and Algeria today. No, there was no reason in those times to import people from Africa, as there were enough folks available between Baghdad and Casablanca.
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Here some info about Andalussiya :
http://en.wikipedia.org/wiki/Umayyad_Caliphate
www.answers.com/topic/umayyad
C) A very important part of the "Arabs" getting into Iberia were Arab Jews, which was the reason why Andalussiya became place of a unique Arab-Jewish high-culture, excelling in science and in arts.
If you look into these reports here
http://books.google.ch/books?id=egbO...age&q=&f=false
it is easy to realize that fairly "dark" Hijazis ruled over white North Africans and Iberians, and not the other way round