MANSUR, ABU YUSUF YA'QUB AL-

in full Abu Yusuf Ya'qub Ibn 'abd Al-mu'min Al-mansur born c. 1160 died Jan. 23, 1199, Marrakech, Mor. third ruler of the Mu'minid dynasty of Spain and North Africa, who during his reign (118499) brought the power of his dynasty to its zenith. When his father, Abu Ya'qub Yusuf, died on July 29, 1184, Abu Yusuf Ya'qub succeeded to the throne with minor difficulties. In November factious tribes in Algeria captured Algiers and other towns, but by 1188 he had pacified his African territories and returned to his Spanish possessions to check the encroachments of the Portuguese and Castilians. His efforts took seven yearsuntil the Battle of Alarcos (July 18, 1195), when he decisively defeated the Castilian army of Alfonso VIII and took the title of al-Mansur (the Victor). The following year he advanced as far as Madrid but was unable to take it. Having defeated all of his enemies, al-Mansur returned to Marrakech, where he went into partial retirement and appointed his son Muhammad as his heir. Al-Mansur was a great builder of public works, many of which still stand.