João Manuel, Prince of Portugal

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João Manuel
Prince of Portugal
John, Prince of Portugal (c.1552-4) - Anthonis Mor.png
João, Prince of Portugal; Antonis Mor, 1552
Born3 June 1537
Royal Palace of Évora, Évora
Died2 January 1554(1554-01-02) (aged 16)
Ribeira Palace, Lisbon
(m. 1552)
Issue Sebastian I of Portugal
House Aviz
Father John III of Portugal
Mother Catherine of Austria
Religion Roman Catholicism

Dom João Manuel, Prince of Portugal (Portuguese pronunciation:  [ʒuˈɐ̃w̃ 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 Austria, daughter of Philip I of Castile and Joanna of Castile. As the heir to the throne he was styled Prince of Portugal.


Early life

Portrait of Prince Joao Manuel; Hieronymus Cock, c. 1550-1554. Joao Manuel, Prince of Portugal by Hieronymus Cock.jpg
Portrait of Prince João Manuel; Hieronymus Cock, c. 1550-1554.

João Manuel was born on 3 June 1537 in the Royal Palace of 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 are believed to have some responsibility for his ill health.

On 11 January 1552, he married Princess Joanna of Spain, his first double-cousin, through both paternal and maternal line, daughter of his paternal aunt Isabella of Portugal and of his maternal uncle, Emperor Charles V.


João Manuel died of what the sources refer to as consumption, which may refer to tuberculosis, on 2 January 1554, but some historians believe his death occurred as a result of diabetes, a disease he may have 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.


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  1. 1 2 3 4 Stephens, Henry Morse (1903). The Story of Portugal. G.P. Putnam's Sons. pp. 139, 279. Retrieved 17 September 2018.
  2. 1 2 Liss, Peggy K. (10 November 2015). Isabel the Queen: Life and Times. University of Pennsylvania Press. p. 11. ISBN   9780812293203.
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João Manuel, Prince of Portugal
Cadet branch of the House of Burgundy
Born: 3 June 1537 Died: 2 January 1554
Portuguese nobility
Preceded by
Prince of Portugal
Succeeded by