Diogo, Constable of Portugal

Master of the Order of Santiago

Diogo
master of the Order of Santiago

constable of Portugal

Born	1425
Died	1443
House	Aviz
Father	John, Constable of Portugal
Mother	Isabel of Barcelos
Religion	Roman Catholicism

Diogo of Portugal (1425–1443) was a Portuguese royal prince, who briefly served as Constable of Portugal and Master of the Order of Santiago.

Diogo was the eldest son of John, Lord of Reguengos de Monsaraz, Infante of Portugal, and of his wife (and niece) Isabella of Barcelos. Through his father, Diogo was the grandson of King John I of Portugal and through his mother, the grandson of Afonso of Barcelos (future first duke of Braganza).

John of Reguengos had been the master of the Order of Santiago since 1418 and Constable of Portugal since 1431. Upon John's premature death in October 1442, the Portuguese regent, Peter of Coimbra decided to appoint John's son Diogo as the new Constable of Portugal. Diogo was elected on 24 January 1443, as the 11th Master of the Order of Santiago. Diogo died a few days later, without issue. Peter appointed his own son, also named Peter, to succeed him as constable.

These appointments were contested by Diogo's half-uncle (and grandfather), Afonso, Count of Barcelos. Afonso had married the daughter of the late beatified constable Nuno Álvares Pereira, and believed their son, Afonso of Ourem, had superior rights to succeed as Constable of Portugal. Peter of Coimbra challenged Barcelos and Ourem to provide documentary proof of the legitimacy of this lineage (which they were unable to produce). Peter of Coimbra attempted to mollify them by creating the title of Duke of Braganza, and investing it in Afonso of Barcelos. However, this failed to heal the breach between Peter and Afonso, which would only grow with time.

Ancestry

Ancestors of Diogo, Constable of Portugal

16. Afonso IV of Portugal

8. Peter I of Portugal

17. Beatrice of Castile

4. John I of Portugal

18. Lourenço Martins

9. Teresa Lourenço

19. Sancha Martins

2. John, Constable of Portugal

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 of Beaumont

1. Diogo, Constable of Portugal

24. Peter I of Portugal (= 8)

12. John I of Portugal (= 4)

25. Teresa Lourenço (= 9)

6. Afonso I, Duke of Braganza

26. Pero Esteves, o Barbadão

13. Inês Pires

27. Maria Anes

3. Isabel of Barcelos

28. Álvaro Gonçalves Pereira

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

References

de Sousa, Antonio Caetano (1735). Historia genealogica da casa real portugueza [Genealogical History of the Royal House of Portugal] (in Portuguese). Vol. 2. Lisboa Occidental. p. 167.

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.

v t e Infantes of Portugal
The generations indicate descent from Afonso I, and continues through the House of Aviz, the House of Habsburg through Infanta Isabel, Holy Roman Empress and Queen of Spain, and the House of Braganza through Infanta Catarina, Duchess of Braganza.
1st generation	Sancho I
2nd generation	Afonso II Infante Pedro, Count of Urgell Infante Fernando, Count of Flanders
3rd generation	Sancho II Afonso III Infante Fernando, Lord of Serpa
4th generation	Dinis I Infante Afonso, Lord of Portalegre
5th generation	Afonso IV Infante Afonso, Lord of Leiria
6th generation	Pedro I
7th generation	Fernando I Infante João, Duke of Valencia de Campos Infante Dinis, Lord of Cifuentes
8th generation	Duarte I Infante Pedro, Duke of Coimbra Infante Henrique, Duke of Viseu Infante João, Constable of Portugal Infante Fernando
9th generation	Afonso V Infante Fernando, Duke of Viseu Infante Pedro, Constable of Portugal Infante João, Prince of Antioch Cardinal-Infante Jaime of Coimbra Infante Diogo, Constable of Portugal
10th generation	João, Prince of Portugal João II Infante João, Duke of Viseu Infante Diogo, Duke of Viseu Manuel I
11th generation	Afonso, Hereditary Prince of Portugal Miguel da Paz, Prince of Portugal and Asturias* João III Infante Luís, Duke of Beja Infante Fernando, Duke of Guarda Cardinal-Infante Afonso Henrique I (The Cardinal-King) Infante Duarte, Duke of Guimarães
12th generation	Afonso, Prince of Portugal Manuel, Prince of Portugal Filipe, Prince of Portugal João Manuel, Prince of Portugal Infante Duarte, Duke of Guimarães
13th generation	Sebastião I Diogo, Prince of Portugal and Asturias§ Filipe II§ Manuel, Hereditary Prince of Portugalƒ
14th generation	Filipe III§ Infante Carlos§ Cardinal-Infante Fernando§ Infante Alonso§
15th generation	Baltasar Carlos, Prince of Portugal and Asturias§ Teodósio, Prince of Brazil Afonso VI Pedro II
16th generation	João, Prince of Brazil João V Infante Francisco, Duke of Beja Infante António Infante Manuel, Count of Ourém
17th generation	Pedro, Prince of Brazil José I Infante Carlos Pedro III Infante Alexandre
18th generation	None
19th generation	José, Prince of Brazil João VI
20th generation	Francisco António, Prince of Beira Pedro I of Brazil & IV of Portugal Miguel I Infante Pedro Carlos#
21st generation	João Carlos, Prince of Beira Pedro II of Brazil‡ Infante Miguel, Duke of Braganzaƒ Infante Sebastião#
22nd generation	Pedro V¶ Luís I¶ Infante João, Duke of Beja¶ Infante Fernando¶ Infante Augusto, Duke of Coimbra¶ Infante Miguel, Duke of Viseuƒ◙ Infante Francisco Joséƒ◙ Infante Duarte Nuno, Duke of Braganzaƒ◙
23rd generation	Carlos I¶ Infante Afonso, Duke of Porto¶ Infante Duarte Pio, Duke of Braganzaƒ
24th generation	Luís Filipe, Prince Royal¶ Manuel II¶ Afonso, Prince of Beiraƒ
* also an infante of Castile and León, Aragon, Sicily and Naples, § also an infante of Spain and an archduke of Austria, # also an infante of Spain, ‡ also an imperial prince of Brazil, ¶ also a prince of Saxe-Coburg and Gotha, Duke in Saxony, ◙ also a prince of Braganza, ¤ title removed in 1920 as their parents' marriage was deemed undynastic, ƒ claimant infante

House of Aviz

João I (1385–1433)

Spouse(s)	Philippa of Lancaster
Children	Duarte I Peter, Duke of Coimbra Henry the Navigator Isabella, Duchess of Burgundy John, Constable of Portugal Ferdinand the Holy Prince

Duarte I (1433–1438)

Spouse(s)	Eleanor of Aragon
Children	Afonso V Ferdinand, Duke of Viseu Eleanor, Holy Roman Empress Catherine Joan, Queen of Castile

Afonso V (1438–1481)

Spouse(s)	Isabel of Coimbra Joanna la Beltraneja
Children	John, Prince of Portugal Joanna João II

João II (1481–1495)

Spouse(s)	Eleanor of Viseu
Children	Afonso, Prince of Portugal

Manuel I (1495–1521)

Spouse(s)	Isabella of Aragon Maria of Aragon Eleanor of Austria
Children	Miguel da Paz, Prince of Portugal João III Isabella, Holy Roman Empress Beatrice, Duchess of Savoy Louis, Duke of Beja Ferdinand, Duke of Guarda Cardinal-Infante Afonso Henrique I Edward, Duke of Guimarães Maria, Duchess of Viseu

João III (1521–1557)

Spouse(s)	Catherine of Austria
Children	Afonso, Prince of Portugal Maria Manuela, Princess of Asturias Manuel, Prince of Portugal Filipe, Prince of Portugal João Manuel, Prince of Portugal

Sebastião I (1557–1578)

Henrique I (1578–1580)

Notes: The House of Aviz is a cadet branch of the House of Burgundy and was succeeded by the House of Habsburg

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