The Battle of Sagrajas (23 October 1086), also called Zalaca or Zallaqah (Arabic: معركة الزلاقة, romanized: Maʿrakat az-Zallāqah), was a conflict fought in 1086 between the Almoravid army, led by their king, Yusuf ibn Tashfin, and the forces of King Alfonso VI of Castile. The Almoravids were called into battle by the taifas, Muslim principalities in Al-Andalus that often fought amongst themselves but united against the expanding Christian kingdoms to the north. In addition to the Almoravid forces, the Taifas, bolstered the Muslim side, tilting the battle in their favor. The battlefield became known as az-Zallaqah (meaning "slippery ground") due to the immense bloodshed that made the terrain treacherous, giving rise to its name in Arabic.
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Battle of Sagrajas in the context of Yusuf ibn Tashfin
Yusuf ibn Tashfin, also Tashafin, Teshufin, (Arabic: يوسف بن تاشفين ناصر الدين بن تالاكاكين الصنهاجي, romanized: Yūsuf ibn Tāshfīn Naṣr al-Dīn ibn Tālākakīn al-Ṣanhājī; reigned c. 1061 – 1106) was a Sanhaja leader of the Almoravid Empire. He cofounded the city of Marrakesh and led the Muslim forces in the Battle of Sagrajas.
Yusuf ibn Tashfin came to al-Andalus from the Maghreb to help the Muslims fight against Alfonso VI of León, eventually achieving victory in Sagrajas and promoting an Islamic legal system in the region. In 1061 he took the title Amir al-Muslimin "Leader of the Muslims", recognizing the suzerainty of the Abbasid caliph as Amir al-Mu'minin "Leader of the Believers".
Battle of Sagrajas in the context of Alfonso VI of León and Castile
Alfonso VI (c. 1040/1041 – 1 July 1109), nicknamed the Brave (El Bravo) or the Valiant, was king of León (1065–1109), Galicia (1071–1109), and Castile (1072–1109).
After the conquest of Toledo in 1085, Alfonso proclaimed himself victoriosissimo rege in Toleto, et in Hispania et Gallecia (most victorious king of Toledo, and of Spain and Galicia). This conquest, along with El Cid's taking of Valencia would greatly expand the territory and influence of the Leonese/Castilian realm, but also provoked an Almoravid invasion that Alfonso would spend the remainder of his reign resisting. The Leonese and Castilian armies suffered decisive defeats in the battles of Sagrajas (1086), Consuegra (1097) and Uclés (1108), in the latter of which his only son and heir, Sancho Alfónsez, died, and Valencia was abandoned but Toledo remained part of an expanded realm that he passed to his daughter.