Alfonso Fernández de Castilla

Alfonso Fernández el Niño (c. 1243–1281) was a Spanish nobleman, the illegitimate son of King Alfonso X of Castile and Elvira Rodríguez de Villada. He was the lord of Molina and Mesa through his marriage to Blanca Alfonso de Molina, daughter of the infante Alfonso of Molina and niece of King Alfonso IX of León.

He was the son of Alfonso X of Castile, King of Castile and León, and Elvira Rodríguez de Villada. His paternal grandparents were Ferdinand III of Castile, King of Castile and León, and his wife, Queen Elisabeth of Swabia. His maternal grandparents were Rodrigo Fernández de Villada and his wife, María Muñoz.

He was the step-brother of, amongst others, Sancho IV of Castile, King of Castile and León, the infante Ferdinand de la Cerda, and of the infante Juan de Castilla.

Alfonso's exact date of birth is unknown, although many historians consider it to be around the year 1243. From 1255 he appears in the historic record as a confirmed benefactor of certain royal privileges. He always enjoyed the confidence of his father, King Alfonso X of Castile due to his ability and competence, demonstrated in both the political and military spheres of royal duties.

In 1262, when he was around 19 years of age, he was charged with presiding over the commission for the division of land of the conquered Taifa of Niebla, expropriating land for the King's brother, Infante Henry of Castile with the help of Pedro Lorenzo, the Bishop of Cuenca. Five years later, in April 1267, he worked with Ferrand García, Archdeacon of Niebla, and the royal scribe, Domingo Ruiz, in the territorial demarcation of Huelva, Isla Saltés, Niebla, and Gibraleón. They were aided in this task by various caballeros, hombres buenos, and Muslim experts who knew the land and the villas to be demarcated.

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