People whom historians identify as Fulani entered present-day Senegal from the north and east. It is certain that they were a mixture of peoples from northern and sub-Saharan Africa. These pastoral peoples tended to move in an eastern direction and spread over much of West Africa after the tenth century.

Their adoption of Islam increased the Fulanis' feeling of cultural and religious superiority to surrounding peoples, and that adoption became a major ethnic boundary marker. The Toroobe, a branch of the Fulani, settled in towns and mixed with the ethnic groups there. They quickly became noted as outstanding Islamic clerics, joining the highest ranks of the exponents of Islam, along with Berbers and Arabs. The Town Fulani (Fulbe Sirre) never lost touch with their Cattle Fulani relatives, however, often investing in large herds themselves. Cattle remain a significant symbolic repository of Fulani values.

https://www.encyclopedia.com/social-sciences-and-law/anthropology-and-archaeology/people/fulani