علي بن يوسف
As a feudatory of the count of Barcelona, he is believed to have been captured by the Almoravids during a battle along the Ebro river in the 1120s, probably 1126. He remained a prisoner of war in North Africa for about a decade until the emergence of the Almohad threat in the Maghrib al-Aqsa induced the emir, Ali ibn Yusuf, to levy a troop of mercenaries among the captive Spanish soldiers (c.1132). Reverter agreed to lead this force, with the express permission of the count of Barcelona.