Ferdinand IV of Castile (6 December 1285 – 7 September 1312) called the Summoned (el Emplazado), was King of Castile and León from 1295 until his death. Ferdinand's upbringing and personal custody was entered to his mother Queen María de Molina, however, he was tutored by his granduncle Henry of Castile the Senator. Queen María attempted to placate the nobility, confronted her son's enemies, and repeated prevented her son from being dethroned. He faced the insubordination of the nobility, led at numerous times by his uncle John of Castile, Lord of Valencia de Campos, and by Juan Núñez II de Lara, who were sometimes supported by another royal relative, Juan Manuel, Prince of Villena. Like his predecessors on the throne, Ferdinand IV continued the Reconquista and, although he failed to conquer Algeciras in 1309, he captured the city of Gibraltar that same year. In 1312 the city of Alcaudete was also conquered. During the Cortes of Valladolid of 1312, he promoted the reform of the administration of justice, among other areas of administration. He attempted to strengthen the royal authority to the detriment of the nobility. He died in Jaén on 7 September 1312 aged 26, and his mortal remains are now in the Royal Collegiate Church of Saint Hippolytus. Source: Wikipedia (en)