The July 16 1212 battle of Las Navas de Tolosa is considered a major turning point in the history of Medieval Iberia. The forces of King Alfonso VIII of Castile were joined by the armies of his peninsular rivals, Sancho VII of Navarre, Peter II of Aragon and Alfonso II of Portugal in battle against the Muslim Almohad rulers of the southern half of the Iberian Peninsula. Caliph al-Nasir led the Almohad army.
The defeat of the Almohads signaled the beginning of a long decline in the power of the Moors in the Iberian Peninsula, and gave further inertia to the Christian Reconquest begun by the kingdoms of northern Iberia in the century before.
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