Explain what you mean between black African. Sub Saharan Africa was hardly developed, Mali would be the only one with the slightest infrastructure due to it's slave trade and gold trade. The rest would just be random tribes. The Moors, Tunisians, Berbers, Moroccans etc were all Islamic Emirates ran by Arabic families. The truth is, if you're talking about "Black Africans", not many would have been past the Sarah desert. People of the Mediterranean were a lot paler in skin colour, looking more Italian if anything. For example the Ancient Greeks have been said to have bright blonde hair, and the average English man has more genetic match up to the pharaohs than the modern day Egyptians. Don't forget that a lot of the settlers in that region, in the historic years of the 11th century would have been Germans, Romans, Greeks, Phoenicians and Arabs. After the fall of Rome and the Byzantine's power was diminished the Arabs swept across North Africa in Jihad, force converting masses of people to Islam. This is the reason you have the North African states, and in Bannerlord there is the Aserai, an Arabic based faction across what would be northern Africa and the Middle East. You're complaining about nothing. The Dev's made the lore and setting perfectly.