يوسف بن تاشفين
In 1086 Yusuf ibn Tashfin was invited by the Muslim "taifa" princes of Al-Andalus in the Iberian Peninsula to defend their territories from the encroachment of Alfonso VI, King of León and Castile. In that year, Ibn Tashfin crossed the Strait of Gibraltar to Algeciras, and defeated Castile at the Battle of az-Zallaqah (Battle of Sagrajas). He was prevented from following up his victory by trouble in Africa, which he chose to settle in person.