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Portuguese royalty
House of Aviz
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| 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 |
| Afonso, Prince of Portugal (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 |
| João, Prince of Portugal |
| Blessed Joana, Princess of Portugal |
| João, Prince of Portugal (future John II) |
| John II |
| Afonso, Prince of Portugal |
| Jorge, Duke of Coimbra (illegitimate) |
| Manuel I |
| Children include |
| Miguel da Paz, Prince of Portugal and of Asturias |
| João, Prince of Portugal (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 |
| Maria Manuela, Princess of Portugal and of Asturias |
| João, Prince of Portugal |
| Grandchildren include |
| Sebastião, Prince of Portugal (future Sebastian I) |
| Carlos, Prince of Asturias |
| Sebastian |
| Henry |
| Anthony (disputed king) |
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Prince João of Portugal (pron. IPA [ʒu'ɐ̃ũ]) (June 3, 1537 - January 2, 1554) (in English: John) was the eighth son of King John III of Portugal by his wife Catherine of Habsburg (House of Hapsburg), daughter of Philip of Burgundy and Joanna of Castile.
João was born in June 3, 1537 in Évora and became the heir to the throne of Portugal in 1539. He survived his four older brothers who died in childhood but was a sickly teenager. The successive inter-marriages between the houses of Spain and Portugal probably had some responsibility for his ill health. In 1552 he married Joan of Spain (princess of Spain), his direct cousin, through both paternal and maternal line, daughter of his paternal aunt Isabel of Portugal and of his maternal uncle Emperor Charles V.
João died of what the sources refer to as consumption (tuberculosis) on January 2, 1554, however it is worth mentioning that some historians believe his death occurred as a result of diabetes. Eighteen days later, a posthumous son was born from his marriage: the future king Sebastian I of Portugal. His death at the age of only sixteen was the beginning of the succession problem in Portugal that would end in the loss of independence to Spain in 1580.
