Pedro de Aguilar
Pedro de Aguilar (1331–1338) was an illegitimate son of Alfonso XI of Castile and his mistress Eleanor de Guzmán, born at Valladolid amid public celebrations. In 1332 the king granted the infant the vast lordships formerly held by Infante Pedro, including Aguilar de Campoo.
From 1333 he confirmed royal charters as son of the king and lord of Aguilar, and in May 1335 Alfonso made him chancellor mayor of Castile. He died at Guadalajara in 1338, still a child.