Sancho of Castile, Count of Alburquerque

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Sancho Alfonso
1st Count of Alburquerque
Sancho's tomb in the Cathedral of Burgos
Born	1342 Sevilla
Died	19 February 1374 (aged 31–32) Burgos
Spouse	Beatrice of Portugal
Issue	Eleanor, Queen of Aragon (illeg.) Leonor Sánchez
House	Castilian House of Ivrea
Father	Alfonso XI of Castile
Mother	Leonor de Guzmán

Sancho Alfonso of Castile (1342–1374), known in Spanish as Don Sancho Alfonso de Castilla, was Infante of Castile, 1st Count of Alburquerque.

He was born in Seville as the ninth of the ten illegitimate children of Alfonso XI of Castile and Leonor de Guzmán.^[1]

He participated in a revolt of the Castilian nobles against the despotic rule of his brother, Peter of Castile. Together with his brothers Henry (future Henry II of Castile), Fadrique and Tello, Sancho fought against his half-brother Peter.

In April 1366, his brother Henry named him Count of Alburquerque, lord of Ledesma, Alba de Liste, Medellín, Tiedra and Montalbán. These lands had been confiscated from the only son of João Afonso de Albuquerque and 7th Lord of Alburquerque. In 1373, Sancho married Beatrice of Portugal,^[2] daughter of Peter I of Portugal and Inês de Castro. They had one daughter:^[3] Eleanor of Alburquerque, who married Ferdinand I of Aragon.

He also had an illegitimate daughter,^[3] Leonor Sánchez de Castilla, who had a liaison with her first cousin Fadrique de Castilla, 1st Duke of Benavente, illegitimate son of Henry II of Castile with mistress Beatriz Ponce de León.

• Lopes, Fernão (1988). The English in Portugal, 1367-87: Extracts from the Chronicles of Dom Fernando and Dom Joao. Translated by Lomax, Derek W.; Oakley, R.J. Aris & Phillips Ltd.
• de Pina Baleiras, Isabel (2020). "Portugal, 1385: a people's choice or coup d'etat?". In Rodrigues, Ana Maria S. A.; Silva, Manuela Santos; Spangler, Jonathan (eds.). Dynastic change : legitimacy and gender in medieval and early modern monarchy. Routledge.
• Francisco de Moxó y de Montoliu, Estudios sobre las relaciones entre Aragón y Castilla, 1997, ISBN 84-7820-387-7