Infante Fernando, Duke of Viseu

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Portuguese royalty
House of Aviz

John I
Children
   Infante Duarte (future Edward I)
   Infante Pedro, Duke of Coimbra
   Henry the Navigator (Infante Henrique, Duke of Viseu)
   Infanta Isabel, Duchess of Burgundy
   Infante João
   Infante Fernando, the Saint Prince
   Afonso, Duke of Braganza (illegitimate)
   Beatriz, Countess of Arundel (illegitimate)
Grandchildren include
   Infanta Isabel of Coimbra, Queen of Portugal
Edward
Children
   Infante Afonso (future Afonso V)
   Infante Fernando, Duke of Viseu
   Infanta Leonor, Holy Roman Empress
   Infanta Catarina
   Infanta Joana, Queen of Castile
Grandchildren include
   Infante Manuel, Duke of Beja (future Manuel I)
   Infanta Leonor of Viseu, Queen of Portugal
Afonso V
Children include
   Blessed Joana, Crown Princess of Portugal
   Infante João (future John II)
John II
   Afonso, Crown Prince of Portugal
   Jorge, Duke of Coimbra (illegitimate)
Manuel I
Children include
   Miguel da Paz, Crown Prince of Spain and Portugal
   Infante João (future John III)
   Infanta Isabel, Holy Roman Empress
   Infanta Beatriz, Duchess of Savoy
   Infante Luís, Duke of Beja
   Infante Fernando, Duke of Guarda and Trancoso
   Infante Cardinal Afonso
   Infante Cardinal Henrique (future Henry I)
   Infante Duarte, Duke of Guimarães
   Infanta Maria
Grandchildren include
   Philip II of Spain (future Philip I of Portugal)
   António, Prior of Crato (future Anthony I) (illegitimate)
   Infanta Maria of Guimarães, Duchess of Parma and Piacenza
   Infanta Catarina of Guimarães, Duchess of Braganza
Great-Grandchildren include
   Teodósio II, Duke of Braganza
   Rannuccio Farnense of Parma
Great-Great-Grandchildren include
   John II, Duke of Braganza (future John IV of Portugal)
John III
Children include
   Infanta Maria Manuela, Princess of Asturias
   João, Crown Prince of Portugal
Grandchildren include
   Infante Sebastião (future Sebastian I)
   Carlos, Prince of Asturias
Sebastian
Henry
Anthony (disputed king)
Ferdinand, Duke of Viseu
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Ferdinand, Duke of Viseu

Ferdinand, Prince of Portugal, Duke of Viseu (14331470, Portuguese: Fernando, pron. IPA [fɨɾ'nɐ̃du]) was the third son of Portuguese King Edward of Portugal and his wife Leonor of Aragon.

Ferdinand was born in Almeirim on November 17, 1433. He became Duke of Viseu when his uncle Henry the Navigator died in 1460. He also succeeded his uncle as Master of the Order of Aviz and responsible for the Discoveries (1460-1470).

He married his cousin Beatrice of Portugal (Portuguese: Beatriz) in 1447, daughter of John, Duke of Aveiro (his uncle).

From that marriage Ferdinand had nine children:

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