"To the south of the Nile [Niger] there is a Negro people called Lamlam. They are unbelievers. They brand themselves on the face and temples. The people of Ghana and Takrur invade their country, capture them, and sell them to merchants who transport them to the Maghrib. There, they constitute the ordinary mass of slaves. Beyond them to the south, there is no civilization in the proper sense. There are only humans who are closer to dumb animals than to rational beings. They live in thickets and caves and eat herbs and unprepared grain. They frequently eat each other. They cannot be considered human beings."
January 1, 1970
https://en.wikiquote.org/wiki/Slavery_in_Africa