علي بن يوسف
According to some scholars, Ali ibn Yusuf represented a new generation of leadership that had forgotten the desert life for the comforts of the city. He was defeated by the combined action of his Christian foes in Iberia and the agitation of the Almohads (Muwahhids) in Morocco. After Ali ibn Yusuf's death in 1143, his son Tashfin ibn Ali lost ground rapidly before the Almohads. In 1146 he was killed in a fall from a precipice while attempting to escape after a defeat near Oran.