The document summarizes the Reconquest of the Iberian Peninsula by Christian kingdoms from the 8th to 15th centuries. It describes how Muslim forces invaded Iberia in the 8th century and established al-Andalus, while Christian refugees founded kingdoms like Asturias-Leon. Over subsequent centuries, the Christian kingdoms expanded southward through battles and taking advantage of conflicts between Muslim taifas. Major developments included reaching the Duero river by the 10th century, the Tajo river by the 12th century, and the Battle of Las Navas de Tolosa in 1212. The Reconquest was completed in 1492 when the Catholic Monarchs conquered the last Muslim kingdom of Granada