Infante Diogo of Viseu (1450-1484) was the second son of Infante Fernando, Duke of Viseu and of his wife Infanta Beatrice 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 angry.
For twice, the king’s life was in risk and as Diogo of Viseu remained the high nobility leader against the King’s policy, 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 married, but when he was quite young he visit the Kingdom of Castile where he was in 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
Bibliography
”Nobreza de Portugal e do Brasil” – Vol. III, pages 544 and 545. Published by Zairol Lda., Lisbon 1989.
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Diogo, Duke of Viseu
Cadet branch of the House of Burgundy
Born: ? 1450 Died: ? 1484 |
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| Portuguese nobility | ||
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| 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 |
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