Ferdinand III of Castille

Reign: 1217 – 1230
Life: 1199–1252

Through his second marriage he was also Count of Aumale. Ferdinand III was one of the most successful kings of Castile, securing not only the permanent union of the crowns of Castile and León, but also masterminding the most expansive southward territorial expansion campaign yet in the Guadalquivir Valley, in which Islamic rule was in disarray in the wake of the defeat of the Almohad caliphate at the Battle of Las Navas de Tolosa. His repeated and decisive victories against the Islamic Caliphate earned him the title Athleta Christi, meaning 'Champion of Christ', which was conferred upon him by Pope Gregory IX. By military and diplomatic efforts, Ferdinand greatly expanded the dominions of Castile by annexing the crown of Guadalquivir river valley in the south of the Iberian Peninsula, establishing the boundaries of the Castilian state for the next two centuries. New territories included important cities such as Baeza, Úbeda, Jaén, Córdoba and Seville, that were subject of Repartimiento, given a new general charter and repopulated in the following years. Places such as the cities of San Fernando, Pampanga and San Fernando, La Union; the Diocese of Ilagan and the San Fernando de Dilao Church in Paco, Manila in the Philippines; and in the United States, in California the City of San Fernando, the San Fernando Valley, and in Texas the Cathedral of San Fernando in San Antonio were named in his honor.

During Ferdinand III of Castille's reign, Erik Eriksson ruled Sweden, Sancho II of Portugal ruled Portugal, and Henry III of England ruled England.

Want to learn more? Further reading

A History of Medieval Spain by Joseph F. O'Callaghan

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The World During Their Reign

The most notable rulers who held power elsewhere at the same time, from European courts to Ottoman, Mughal, and Chinese thrones.

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From the library

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A History of Medieval Spain

Joseph F. O'Callaghan

The standard reference for Ferdinand's Reconquista and the making of Castilian power.

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Ferdinand III of Castille

The World During Their Reign

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Go deeper on Ferdinand III of Castille

A History of Medieval Spain

Imperial Spain, 1469–1716

A History of Medieval Spain