|1st Count of Alburquerque|
Sancho's tomb in the Cathedral of Burgos
|Died||19 March 1374 (aged 31–32)|
|Spouse||Beatrice of Portugal|
|Issue||Fernando Sánchez, 2nd Count of Alburquerque|
Eleanor, Queen of Aragon
(illeg.) Leonor Sánchez
|House||Castilian House of Ivrea|
|Father||Alfonso XI of Castile|
|Mother||Leonor de Guzmán|
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 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.
|Ancestors of Sancho Alfonso|
- de Sousa, Antonio Caetano (1735). Historia genealogica da casa real portugueza. Lisboa Occidental. p. 415.