There are black Berbers like Black zenaga (which means sanhaja) and Black taureg. It seems you conflated the pre-colonial term sudani with the colonial term for black. You are not mahgrebi johnincornwall so it makes no sense as you a westerner to adopt mahgrebi terms when westerners of both america and birttain already have their own.
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Ironically, Ibn Kalikhan makes it clear that when looking at a battle field from a distance, the sanhaja soldiers with lamta shields look like the sudan directly.
This sanhaja man (you can tell by his clothes) of southern maurtiania is black. You are not mahgrebi so you using mahgrebi term of sudani as a stand-in for the western (you are a westerner) term black is really strange.
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There are more reports of white concubines, particularly in the city of audoghust, the original capital of the Lamtuna Confederation. This confederation was brief and was preceded by the Za dynasty of Gao and suceeded by the Ghana empire. Zafun would rule over the sanhaja veiled ones during the almoravid period.
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Strange, you just never mentioned intermarriage. Are you implying marriage with sub saharans could only be through slavery? Why would you make such a charged resonse about an entire people group. People in Mauritania that I know personally are half Zenaga and half Soninke by regular marriage in the slave holding country of Mauritania.