Sancho Alfonso, 1st Count of Alburquerque

Sancho Alfonso
1st Count of Alburquerque
File:Arms of Sancho of Castile (son of Alfonso XI el Justiciero).svg Arms of Sancho of Castile
Born	1342 Sevilla
Died	19 March 1374 (aged 31–32) Burgos
Spouse	Beatrice of Portugal
Issue	Fernando Sánchez, 2nd Count of Alburquerque Eleanor, Queen of Aragon
House	House of Burgundy-Spain
Father	Alfonso XI of Castile
Mother	Eleanor of Guzman

Sancho Alfonso de Castilla (1342–1374) is known in Spanish as Don Sancho Alfonso de Castilla, Infante de Castilla, I conde de Alburquerque.

He was the ninth of the ten illegitimate children of King Alfonso XI of Castile and Lady Eleanor de Guzmán.

He was born in Seville. He participated in a revolt of the Castilian nobles against the despotic rule of his brother, Pedro of Castile.

In 1373 he married Beatrice of Portugal, daughter of Peter I of Portugal and Inês de Castro. They had two children: Fernando Sánchez, 2nd Count of Alburquerque, and Eleanor of Alburquerque, who married Ferdinand I of Aragon.

He also had an illegitimate daughter, Leonor Sánchez de Castilla, who married Fadrique de Castilla y Ponce de Leon, illegitimate son of Henry II, King of Castile.

Ancestors

Family of Sancho Alfonso, 1st Count of Alburquerque

16. Alfonso X of Castile               8. Sancho IV of Castile                       17. Violant of Aragon               4. Ferdinand IV of Castile                             18. Alfonso of León, Lord of Molina               9. María de Molina                       19. Mayor Alonso de Meneses               2. Alfonso XI of Castile                                   20. Afonso III of Portugal               10. Denis of Portugal                       21. Beatrice of Castile               5. Constance of Portugal                             22. Peter III of Aragon               11. Elizabeth of Aragon                       23. Constance of Sicily               Sancho, 1st Count of Alburquerque                                         24. Pedro Nuñez de Guzman, Lord of Derruña and San Roman               12. Álvaro Perez de Guzman                       25. Teresa Rodriguez Brizuela               6. Pedro Núñez de Guzmán                             26. Gonzalo Rodriguez Giron               13. Maria Giron                       27. Elvira Diaz de Castañeda               3. Eleanor of Guzman                                   28. Pedro Ponce de Cabrera               14. Fernán Pérez Ponce de León, Lord Cangas and la Puebla                       29. Aldonza Alonso de León               7. Beatriz Ponce de León                             30. Gutierre Suarez de Meneses, Lord of de la Osa, San Felices and Dosbarrios               15. Urraca Gutiérrez de Meneses                       31. Elvira Anes de Sousa

References

Francisco de Moxó y de Montoliu, Estudios sobre las relaciones entre Aragón y Castilla, 1997, ISBN 84-7820-387-7