When you hear “African kings sold their black brothers into slavery” argument remember (1.) African kings largely thought [tribally] NOT racially, and (2.) slaves were largely caught as WAR prizes; they weren't "their own", they were from another tribe. They were enemies.
Most of slaves sold by African chiefs were WAR CAPTIVES (other tribesmen). (cont) http://tl.gd/n_1spqq8h
There was representation of slaves, the freeborn and the nobility at the royal court in most African states. (cont) http://tl.gd/n_1sn7tuq