Sancho Alfonso of Castile
Sancho Alfonso of Castile, called the Mute (Valladolid, c. 1332–1342), was one of the ten children Alfonso XI had with his mistress Eleanor of Guzmán, a brother of Henry II of Castile and a half-brother of Peter I. Described as mute and feeble-minded, he nonetheless held several lordships, including Ledesma and Béjar, and served briefly as the king's standard-bearer.
He died about 1342, still a boy. A younger brother of the same name, born in 1343, later became Count of Alburquerque.