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Infante John Manuel
Spouse Infanta Joan of Spain
Sebastian of Portugal
House House of Aviz-Beja
Father John III of Portugal
Mother Catherine of Habsburg
Born 3 June 1537(1537-06-03)
Died 2 January 1554 (aged 16)

John Manuel, Prince of Portugal (Portuguese: João Manuel, Portuguese pronunciation: [ʒuˈɐ̃ũ mɐnuˈɛɫ]) (3 June 1537 – 2 January 1554) was a Portuguese infante (prince), the eighth son of King John III of Portugal by his wife Catherine of Habsburg (House of Habsburg), daughter of Philip I of Castile and Joanna of Castile. As the heir to the throne he was styled Prince of Portugal.

John Manuel was born in 3 June 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 first cousin, through both paternal and maternal line, daughter of his paternal aunt Isabella of Portugal and of his maternal uncle Emperor Charles V.

John Manuel died of what the sources refer to as consumption (tuberculosis) on 2 January 1554, however it is worth mentioning that some historians believe his death occurred as a result of diabetes, a disease he inherited from his maternal grandfather Philip I. Eighteen days later, a posthumous son was born from his marriage: the future King Sebastian I of Portugal.

John Manuel, Prince of Portugal
Cadet branch of the House of Burgundy
Born: 3 June 1537 Died: 2 January 1554
Preceded by
Prince of Portugal
Succeeded by


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