"Their qualities of character, moreover, are close to those of dumb animals. It has ever been reported that most of the Negroes of the first [climatic] zone dwell in caves and thickets, eat herbs, live in savage isolation and do not congregate, and eat each other. The same applies to the Slavs. The reason for this is that their remoteness from being temperate produces in them a disposition and character similar to those of the dumb animals, and they become correspondingly remote from humanity."
January 1, 1970
https://en.wikiquote.org/wiki/Ibn_Khaldun