Infante Diogo, Duke of Viseu

Infante Diogo, Duke of Viseu
Portuguese royalty
House of Avis
Ordem Avis.svg

John I
   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
   Afonso V
   Ferdinand, Duke of Viseu
   Eleanor, Holy Roman Empress
   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.



See also

External links


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

Infante Diogo, Duke of Viseu
Cadet branch of the House of Burgundy
Born: ? 1450 Died: ? 1484
Portuguese nobility
Preceded by
John of Viseu, 2nd Duke of Beja
Armas duques beja.png
Duke of Beja

Succeeded by
Manuel of Viseu, 3rd Duke of Beja
Preceded by
John, 3rd Duke of Viseu
Armas duques beja.png
Duke of Viseu

Succeeded by
Manuel, 5th Duke of Viseu

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