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In page Reconquista:

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The split into the taifa states weakened the Islamic presence, and the Christian kingdoms further advanced as Alfonso VI of Leon and Castile conquered Toledo in 1085. Surrounded by enemies, taifa rulers sent a desperate appeal to the Berber chieftain Yusuf ibn Tashfin, leader of the Almoravids.[citation needed] Taifas reemerged when the Almoravid dynasty collapsed in the 1140s, and again when the Almohad Caliphate declined in the 1220s.[citation needed]