Whether slavery existed within sub-Saharan African societies before the arrival of Europeans is a hotly contested point between Afrocentric and Eurocentric academics. What is certain is that Africans were subjected to several forms of slavery over the centuries, including CHATTEL slavery under both the Muslims with the trans-Saharan slave trade, and Europeans through the trans-Atlantic slave trade.

There are reports that CHATTEL slavery still exists in Islamic North Africa, in such countries as Mauritania and Sudan (despite both countries being participants in the 1956 UN slavery convention).

https://www.thoughtco.com/types-of-slavery-in-africa-44542