St. Ferdinand III was the King of Castile and León, known for his piety, wisdom, and military victories that expanded Christian rule in Spain. He united his kingdom, strengthened Christianity, and was deeply devoted to justice and the Church. His feast day is May 30, and he is the patron saint of rulers and engineers.
St. Ferdinand III was born in 1199 to King Alfonso IX of León and Queen Berengaria of Castile. His mother was a devout woman who raised him in deep Christian faith, instilling in him a love for justice, humility, and service to God. When he was still a young man, his mother secured the throne for him, making him King of Castile in 1217 and later King of León in 1230, uniting both kingdoms.
Ferdinand III is remembered for his military victories against the Moors, which helped reclaim much of Spain for Christianity. He conquered Córdoba, Seville, and other cities, always showing mercy to the defeated, allowing religious freedom, and protecting Muslims and Jews under his rule. He carried a relic of the Virgin Mary into battle and credited all victories to God, rather than his own strength.
Beyond warfare, he was a just and wise ruler, promoting education, building churches, and reforming laws to reflect Christian morals. He founded the University of Salamanca, one of the oldest universities in Europe. He also had a deep devotion to the Blessed Virgin Mary and often spent long hours in prayer and fasting.
He died on May 30, 1252, in Seville, Spain, after a life dedicated to God, justice, and his people. He was canonized in 1671 by Pope Clement X. His body remains incorrupt in Seville Cathedral, dressed in his royal robes.