The figure of Alfonso X, the only Castilian monarch who proudly titled himself "King of Andalusia," is essential for understanding the genesis of this region's historical identity. More than seven hundred years after his death, debate persists regarding the defining elements of Andalusian essence, often linked to a physical territory and past civilizations such as the Tartessians or the Andalusians.
However, a current academic perspective emphasizes that cultural identity shapes territory, not the other way around. In this sense, the historical Andalusia we know today was primarily forged through the Castilian conquest and repopulation, especially during the reigns of Ferdinand III the Saint and, crucially, Alfonso X.
The genesis of that historical Andalusia, always well-defined in time and space, had developed as a direct consequence of the Castilian conquest and repopulation process during the reigns of monarchs Ferdinand III, the Saint, and especially Alfonso X, the Wise.
The Christian conquerors imposed new social and administrative structures, transforming the major cities of the Guadalquivir valley. Alfonso X's policy laid the foundations for the new medieval Andalusia, with its three kingdoms: Córdoba, Jaén, and Seville. The ancient Nasrid kingdom of Granada would be incorporated later, at the end of the 15th century.
The work of the Wise King was decisive in organizing the complex demographic, social, economic, legal, linguistic, and religious structures of Andalusia. While Ferdinand III reintegrated the Andalusian territory into Christian civilization, it was Alfonso X who definitively incorporated it into the powerful kingdom of Castile and León as a vast and strategic space of primary importance, particularly due to its royal cities such as Jerez, Carmona, Écija, Úbeda, Baeza, Córdoba, Jaén, and especially Seville with its port and river.
Far from being a mere Castilian appendage, the three Andalusian kingdoms developed distinctive elements of enormous geopolitical value. The creation of the Adelantamiento de Andalucía or the Frontier in 1253 by Alfonso X reflected Andalusia's status as a borderland and a land of opportunity. Its lexicon, material heritage, and Islamic cultural legacy, along with royal charters and ordinances, consolidated a land of promise with extensive socioeconomic possibilities and personal freedoms. The language, faith, and current social, economic, and legal structures of Andalusia are rooted in this process of Christian conquest and repopulation driven by Alfonso X, considered the most universal of medieval monarchs.
