Sao

The Sao were the earliest civilization to leave clear traces around Lake Chad, developing in the Chari River basin from older iron-age cultures such as Gajiganna from about the sixth century BCE. They lived in independent walled city-states under a divine ruler who showed himself only behind a screen, while the queen mother and the ruler's senior sister held political weight.

Settled farmers and craftsmen, the Sao worked bronze, copper and iron, leaving terracotta figures and funerary urns. Their city-states reached their height between the ninth and fifteenth centuries, long resisting Kanem and Bornu. Bornu's Kanuri rulers adopted many Sao customs.

Most scholars hold that the Sao ceased to be a separate culture in the 1500s, absorbed into the expanding Bornu Empire and Islam. The Kotoko, Sara, Buduma, Kanembu and Musgum peoples all claim Sao ancestry.