Alfonso de Castilla y Molina
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Alfonso de Castilla y Molina (1286 in Valladolid – 1291 in Valladolid) was a Spanish noble in the service of the Kingdom of Castile. He was an Infante de Castilla, son of King Sancho IV de Castilla, King of Castile and of his wife, the Queen María de Molina.
Alfonso was the son of King Sancho IV of Castile and his wife the queen, María de Molina. His paternal grandparents were Alfonso X of Castile and his wife, Violant of Hungary, herself the daughter of James I of Aragon. His maternal grandparents were the infante Alfonso de Molina, son of Alfonso IX of Leon and his third wife, Mayor Alfonso de Meneses. He was the brother of Ferdinand IV of Castile Pedro de Castilla y Molina, Felipe, Enrique de Castilla y Molina, Beatriz and Isabella, amongst others.