João, Duke of Viseu
Infante João of Viseu (ca. 1448 – 1472) was the older son of Infante Fernando, Duke of Viseu and of his wife Infanta Beatrice of Portugal.
In 1470, following his father's death, he inherited the titles of Duke of Viseu and Duke of Beja, as well as the Lordships of Covilhã and Moura
He also became Master of the Order of Christ and of the Order of Santiago, becoming also Constable of Portugal.
In July 1472, his uncle, King Afonso V granted him the Moroccan city of Anfa (in Portuguese Anafé).
He died young and single, without issue. His brother, Infante Diogo, inherited his titles and estates.
| Ancestors of João, 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 John, 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 Barcelos|
|30. Nuno Álvares Pereira|
|15. Beatriz Pereira de Alvim|
|31. Leonor de Alvim|
- ”Nobreza de Portugal e do Brasil” – Vol. II, page 409. Published by Zairol Lda., Lisbon 1989.