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In page Alfonso XI of Castile:

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Born on 13 August 1311 in Salamanca,[1] he was the son of King Ferdinand IV of Castile[2] and Constance of Portugal.[3] His father died when Alfonso was one year old.[4] His grandmother, María de Molina, his mother Constance, his granduncle Infante John of Castile, son of King Alfonso X of Castile and uncle Infante Peter of Castile, son of King Sancho IV assumed the regency. His mother died first on 18 November 1313, followed by Infantes John and Peter during a military campaign against Granada in 1319 at the Disaster of the Vega, which left Dowager Queen María as the only regent until her death on 1 July 1321.[citation needed]