Infante Diogo, Duke of Viseu

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

Infante Diogo of Viseu (1450–1484) was the second son of Infante Fernando, Duke of Viseu and of his wife Beatriz of Portugal.

In 1472, when his older brother (John, Duke of Viseu) died without issue, he inherited his titles and estates, becoming 4th Duke of Viseu and 3rd Duke of Beja.

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.

Ancestry

See also

• Duke of Beja
• Duke of Viseu
• List of Portuguese Dukedoms

External links

• Genealogy of Diogo, 4th Duke of Viseu, in Portuguese

Bibliography

”Nobreza de Portugal e do Brasil” – Vol. III, pages 544 and 545. Published by Zairol Lda., Lisbon 1989.

Infante Diogo, Duke of Viseu House of Aviz Cadet branch of the House of Burgundy Born: ? 1450 Died: ? 1484
Portuguese nobility
Preceded by John of Viseu, 2nd Duke of Beja	Duke of Beja 1472–1484	Succeeded by Manuel of Viseu, 3rd Duke of Beja
Preceded by John, 3rd Duke of Viseu	Duke of Viseu 1472–1484	Succeeded by Manuel, 5th Duke of Viseu

Persondata
Name	Diogo, Duke Of Viseu
Alternative names
Short description
Date of birth	1450
Place of birth
Date of death	1484
Place of death