thanks for that info faisal, I'm not really 100% sure on the Muslim factions, I knew that the Almoravids were invited into Spain to help the local Muslim chieftains defend against the reconquista and then took power, then the Almohads took over from them, but one thing I'm not sure about, were they actually a different people or not? I was under the impression they were, or were they just different sects or 'political parties' for want of a better term in Islamic North Africa? This has been bugging me for ages, and I haven't really found a good answer on it yet.