Djolof
With the Arab conquests of West Africa in last centuries of the 1st millennium CE, one theory states that the Wolof people were forced to move into north and east Senegal where over time villages developed into autonomous states such as Baol, Kayor, Saloum, Dimar, Walo, and Sine the overall ruling state being that of Jolof who came together voluntarily to form the Jolof Empire. According to Gamble, this migration likely occurred at the end of 11th century when the Ghana Empire fell to the Muslim armies from Sudan.