In the 14th century the Jolof Empire grew more powerful, having united Cayor and the kingdoms of Baol, Siné, Saloum, Waalo, Futa Tooro and Bambouk, or much of present-day West Africa. The empire was a voluntary confederacy of various states rather than being built on military conquest. The empire was founded by Ndiadiane Ndiaye, a part Serer and part Toucouleur, who was able to form a coalition with many ethnicities, but collapsed around 1549 with the defeat and killing of Lele Fouli Fak by Amari Ngone Sobel Fall.