Banu Salaym represented the southern movement of Arabs into the Maghrib, during the early decades of 1000 A.D. and the eventual arabisation of North Africa and Sudan. Originating in Egypt, Arab nomads took a southernly route, south of the Atlas Mountains. During the 1200s and 1300s, arabised Berber tribes moved eastward into Nubia. Between the 1200s-1300s, the Arab language took hold in Egypt, Maghreb, and Sudan.
Shillington, Kevin (2005). History of Africa. Revised 2nd ed. New York: Palgrave Macmillan, pp. 157, ISBN 0-333-59957-8