The Senussi, a political-religious brotherhood, founded in Mecca by Sayyid Muhammad ibn Ali as-Senussi in 1837, came to become the Emirs of Cyrenaica in 1917 and then in 1922, the Emirs of Tripoli. The dynasty is of the Chofra descent through their sixth Senussi sultan, Ali ibn Omar. They came to be the kings of Libya.