The Alcázar de los Reyes Cristianos (Spanish for "Castle of the Christian Monarchs"), also known as the Alcázar of Córdoba, is a medieval alcázar (Arabic: القصر, romanized: Al-Qasr, lit. 'The Palace') located in the historic centre of Córdoba (in Andalusia, Spain), next to the Guadalquivir River and near the Mosque-Cathedral. The fortress served as one of the primary residences of Isabella I of Castile and Ferdinand II of Aragon.

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