Abu Yusuf Yaqub al-Mansur, Moroccan caliph (born 1160)

Abū Yūsuf Yaʿqūb ibn Yūsuf ibn Abd al-Muʾmin al-Manṣūr, commonly known as Yaqub al-Mansur or Moulay Yacoub, was the third Almohad caliph. Succeeding his father, al-Mansur reigned from 1184 to 1199. His reign was distinguished by the flourishing of trade, architecture, philosophy and the sciences, as well as by victorious military campaigns in which he was successful in repelling the tide of the Reconquista in the Iberian Peninsula.