Tibu.

The Tibu were descendants of a group of people who originally lived in the Sahara thousands of years ago. As the Sahara began to dry up, this group of people moved into the Tibesti and Ahaggar mountain ranges. The Tibu were originally a Neolithic hunting culture, but as animals began to disappear from their environment, they became subsistence farmers, living on the fringes of the mountain ranges until historical times. There is evidence that the culture, at least for part of its history, was matriarchal.