According to historian Ibn Khaldun , when the Marinid dynasty took Conquering control over Salé from the Almohad Caliphate , Yacoub ben Abdellah le Mérinide rebelled Hostile_encounter against his uncle Abu Yusuf Yaqub ibn Abd Al-Haqq , and sought the assistance Assistance of King Alfonso X. Ruy López de Mendoza , Admiral of Castile formed Coming_to_be an armada to assist Assistance with Castilian crusades on the North African coast .