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In page Reconquista:

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After a brief period of disintegration (the second Taifa period), the Almohads, the rising power in North Africa, took over most of al-Andalus. However they were decisively defeated at the Battle of Las Navas de Tolosa (1212) by a Christian coalition, losing almost all the remaining lands of al-Andalus in the following decades. By 1252 only the Emirate of Granada remained intact but as a vassal state of Castile.[citation needed]