John III of Portugal Totally Explained

Death and succession

From 1539, the heir to the throne was John, prince of Portugal, who married Joan of Spain, daughter of Charles V. But Prince John was a sickly child (and the sole son of John III to survive childhood) and died young (of tuberculosis), when the princess was giving birth to Prince Sebastian in January 1554. When John III died of apoplexy in 1557, only heir was his grandson, Sebastian, who was just three years old.
To this day, John's body rests in the Monastery of Jerónimos in Lisbon.

Issue

Name	irth	eath	otes
By Catherine of Habsburg (married February 10, 1525)
Prince Afonso	February 24, 1526	March 1526	Prince of Portugal (1526).
Princess Maria Manuela	October 15, 1527	August 12, 1545	Princess of Portugal (1527-1531). Princess consort of Asturias by marriage to King Philip II of Spain, then Prince of Asturias. She had one deformed child, Don Carlos, and she died a few days after his birth.
Infanta Isabel	April 28, 1529	April 28, 1529
Infanta Beatriz (Beatrice)	February 15, 1530	February 15, 1530
Prince Manuel	November 1, 1531	April 14, 1537	Prince of Portugal (1531-1537). Declared heir in 1535.
Prince Filipe (Philip)	March 25, 1533	April 29, 1539	Crown Prince of Portugal (1537-1539). Declared heir in 1537.
Infante Dinis (Denis)	April 6, 1535	January 1, 1537
Prince João (John)	June 3, 1537	January 2, 1554	Prince of Portugal (1537-1554). Declared heir in 1539. Married Joan of Spain. Their son became King Sebastian I.
Infante António (Anthony)	March 9, 1539	January 20, 1540
By Isabel Moniz
Duarte, Archbishop of Braga	1521	November 11 1543	Natural son.

Style

Like his predecessors John used the style "El-rei" (the king) followed by "Dom" (abbreviated to D.), a mark of high esteem for a distinguished Christian nobleman.
The official style was the same used by his father Manuel I: "Dom João, by the grace of God, King of Portugal, of the Algarves, of either side of the sea in Africa, Lord of Guinea, & of the Conquest, Navigation, & Commerce of Ethiopia, Arabia, Persia, & India" (Dom João, por graça de Deus, Rei de Portugal, e dos Algarves, d'aquém e d'além mar em África, Senhor da Guiné, e da Conquista, Navegação, & Comércio da Etiópia, Arábia, Pérsia, & Índia). This style would only change in the 19th century when Brazil became a Vice-Kingdom.

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