Sao Civilization (sixth century B.C. to late 16th century A.D.)
The Sao civilization flourished in middle Africa from around the sixth century B.C. to as late as the 16th century A.D. The Sao lived by the Chari River south of Lake Chad in territory that later became part of Cameroon and Chad. Sao artifacts show that they were skilled workers in bronze, copper and iron.