Wonderful list at:
Askia, for example, was probably the first ruler in world history to have a Minister in charge of Fisheries. Mansa Musa, Samora Machel, Amina of Zaria, Jaja of Opobo--people the rest of the world should know about; and not just to give them their due, but so we can understand our own heritage better, all of us. For a better understanding of history makes us all better people and able to build a better world.
And I have intentionally not listed here the leaders that the world does often talk about: Mandela, Nefertari, and the like.