 The century in which the Zaghawa people adopted Islam has been a subject of debate and little consensus, with estimates ranging from the 13th to the early 17th century.The Zaghawa society has been socially stratified and has included castes.The upper strata has been of nobles and warriors, below them have been the traders and merchants, below whom have been the artisan castes called the "Hadaheed" (or "Hadahid").