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Born in Toledo, Spain, Alfonso was the eldest son of Ferdinand III of Castile and Elisabeth of Hohenstaufen, known in Spain as Beatriz de Suabia, through whom he was a cousin of Frederick II, Holy Roman Emperor. In the  period 1240–1250 he conquered several Muslim strongholds in Al-Andalus alongside his father, such as Murcia, Alicante and Cadiz. In the siege of Niebla (1262) he used cannon to defeat the Muslim defenders. This is the first recorded use of gunpowder for military purposes by Europeans - ironically a technqiue learned from his Muslim opponents.
The Catholic Monarchs (Spanish: los Reyes Católicos) is the collective title used in history for Queen Isabella I of Castile and King Ferdinand II of Aragon. They were both from the House of Trastámara and were second cousins, being both descended from John I of Castile; they were given a papal dispensation to deal with consanguinity by Sixtus IV. The title of ‘Catholic King and Queen’ was bestowed on them by the Pope Alexander VI in 1496. They married on October 19, 1469, in the city of Valladolid; Isabella was 18 years old and Ferdinand a year younger. Their marriage united both crowns under the same family.
Isabella I (22 April 1451 – 26 November 1504) was Queen of Castile and Leon. She and her husband Ferdinand II of Aragon (10 March 1452 – 23 January 1516) brought stability to both kingdoms that became the basis for the unification of Spain. Later the two laid the foundation for the political unification of Spain under their grandson, Charles V, Holy Roman Emperor. From a painting of 'The Reconquest of Granada' by Pedro Marcuello.