Diogo of Portugal

Portuguese royalty
House of Avis

John I Children    Edward I    Peter, Duke of Coimbra    Henry the Navigator    Isabella, Duchess of Burgundy    John, Lord of Reguengos de Monsaraz    Ferdinand the Saint Prince Grandchildren include    Isabella, Queen of Portugal Edward Children    Afonso V    Ferdinand, Duke of Viseu    Eleanor, Holy Roman Empress    Catherine    Joan, Queen of Castile Grandchildren include    Manuel I    Eleanor, Queen of Portugal    Isabella, Duchess of Braganza Great-Grandchildren include    James, Duke of Braganza, Prince of Portugal Afonso V Children include    John, Prince of Portugal    Joan, Princess of Portugal    John II John II    Afonso, Prince of Portugal

Diogo of Portugal (1425–1443) was a Portuguese infante, son of John, Lord of Reguengos de Monsaraz, infante of Portugal, and of his wife (and niece) Isabella of Braganza. Through his father Diogo was grandson of king John I of Portugal and through his mother he was grandson of Alphonse, first duke of Braganza.

Following his father's death (1442) he received the title of Constable of Portugal, and was also elected, in 24 January 1443, as 11th. Master of the Order of Santiago.

This was one of the causes of the quarrel between the regent infante Pedro, Duke of Coimbra and his half-brother Afonso, Duke of Braganza, once Afonso wanted the Constable position to his own son.

Diogo died unmarried later the same year, without issue.

Ancestry

16. Afonso IV of Portugal

8. Peter I of Portugal (=#24)

17. Beatrice of Castile

4. John I of Portugal

18. Lourenço Martins

9. Teresa Lourenço (=#25)

19. Sancha Martins

2. John, Lord of Reguengos de Monsaraz

20. Edward III of England

10. John of Gaunt, 1st Duke of Lancaster

21. Philippa of Hainault

5. Philippa of Lancaster

22. Henry of Grosmont, 1st Duke of Lancaster

11. Blanche of Lancaster

23. Isabel de Beaumont

1. Isabella of Portugal

24. Peter I of Portugal (=#8)

12. John I of Portugal

25. Teresa Lourenço (=#9)

6. Afonso, 1st Duke of Braganza

26. Pero Esteves, o Barbadão

13. Inês Pires

27. Maria Anes

3. Isabella of Braganza

28. Álvaro Gonçalves Pereira, Prior of Crato

14. Nuno Álvares Pereira

29. Iria Gonçalves do Carvalhal

7. Beatriz Pereira de Alvim

30. João Pires de Alvim

15. Leonor de Alvim

31. Branca Pires Coelho

External links

• Genealogical information on Diogo, Constable of Portugal (in Portuguese)

Bibliography

"Nobreza de Portugal e do Brasil" – Vol. I, page 297. Published by Zairol Lda., Lisbon 1989.

Persondata
Name	Diogo Of Portugal
Alternative names
Short description
Date of birth	1425
Place of birth
Date of death	1443
Place of death