- Infante Diogo, Duke of Viseu
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
He was a popular personality in his cousin’s (King John II) royal court and, together with the Duke of Braganza, they were the main targets of king John’s centralization policy, who was fighting against the high aristocracy power, which was supported during his father’s (Afonso V) reign.
The first victim was the husband of his sister Isabella, Fernando II, 3rd Duke of Braganza , who was imprisoned, judged and executed in Évora. Once his sister, Leonor of Viseu, was married to the king, Diogo thought he was protected from the king’s anger.
On two occasions, the king’s life was in danger and as Diogo of Viseu remained the high nobility leader against the King’s policies, John II accused him of high treason and killed him.
After the execution, King John II called the duke’s younger brother, Infante Manuel of Viseu, and showing him his brother’s body, he promised he would be considered as his own son. In that moment, Manuel inherited his brother’s Diogo titles and estates.
The Duke Diogo didn’t marry, but when he was quite young he visited the Kingdom of Castile where he was loved by Doña Leonor de Sotomaior y Portugal (great-granddaughter of King Pedro I of Portugal), from whom he had a natural son, Afonso de Portugal. King Manuel I of Portugal, granted his nephew, Afonso de Portugal, the position of 8th Constable of Portugal. Afonso’s daughter and heir, Beatrice of Lara, married the 3rd Marquis of Vila Real.
Ancestors of Infante Diogo, Duke of Viseu 16. Peter I of Portugal (= 24) 8. John I of Portugal (= 12, 28) 17. Teresa Lourenço (= 25) 4. Edward of Portugal 18. John of Gaunt, 1st Duke of Lancaster (= 26) 8. Philippa of Lancaster (= 13) 19. Blanche of Lancaster (= 27) 2. Infante Fernando, Duke of Viseu 20. John I of Castile 10. Ferdinand I of Aragon 21. Eleanor of Aragon 5. Eleanor of Aragon 22. Sancho Alfonso, 1st Count of Alburquerque 11. Eleanor of Alburquerque 23. Beatrice of Portugal 1. Infante Diogo, Duke of Viseu 24. Peter I of Portugal (= 16) 12. John I of Portugal (= 8, 28) 25. Teresa Lourenço (= 17) 6. Infante João, Lord of Reguengos 26. John of Gaunt, 1st Duke of Lancaster (= 18) 13. Philippa of Lancaster (= 9) 27. Blanche of Lancaster (= 19) 3. Infanta Beatriz of Portugal 28. John I of Portugal (= 8, 12) 14. Afonso, 1st Duke of Braganza 29. Inês Pires Esteves 7. Isabella of Braganza 30. Nuno Álvares Pereira 15. Beatriz Pereira de Alvim 31. Leonor de Alvim
”Nobreza de Portugal e do Brasil” – Vol. III, pages 544 and 545. Published by Zairol Lda., Lisbon 1989.Infante Diogo, Duke of ViseuCadet branch of the House of BurgundyBorn: ? 1450 Died: ? 1484
Portuguese nobility Preceded by
John of Viseu, 2nd Duke of Beja
Duke of Beja
Manuel of Viseu, 3rd Duke of Beja
John, 3rd Duke of Viseu
Duke of Viseu
Manuel, 5th Duke of Viseu
Infantes of Portugal 1st GenerationInfante Henrique • Sancho I • Infante João 2nd Generation 3rd Generation 4th Generation 5th GenerationInfante Afonso, Lord of Leiria • Afonso IV 6th GenerationInfante Afonso • Infante Dinis • Peter I • Infante João 7th Generation 8th Generation 9th Generation 10th Generation 11th GenerationAfonso, Prince of Portugal • Infante João • Miguel da Paz, Prince of Portugal and Asturias^ • John III • Infante Luís, 5th Duke of Beja • Infante Fernando, Duke of Guarda and Trancoso • Cardinal-Infante Afonso • Henry, The Cardinal-King • Infante Duarte, 4th Duke of Guimarães • Infante António • Infante Carlos 12th GenerationAfonso, Prince of Portugal • Manuel, Prince of Portugal • Filipe, Prince of Portugal • Infante Dinis • John Manuel, Prince of Portugal • Infante António 13th Generation 14th Generation 15th GenerationBalthasar Charles, Prince of Portugal and Asturias* • Infante Francisco Fernando* • Teodósio, 1st Prince of Brazil • Afonso VI • Peter II 16th GenerationJoão, 3rd Prince of Brazil • John V • Infante Francisco, 7th Duke of Beja • Infante António • Infante Manuel, Count of Ourém • 17th Generation 18th Generationnone 19th Generation 20th Generation 21st Generation 22nd Generation 23rd Generation 24th Generation^also an infante of Castile and León, Aragon, Sicily and Naples, *also an infante of Spain, **claimant infante, ^^only prince or infante by marriage
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