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Infante John
Constable of Portugal Lord of Reguengos, Colares, and Belas
Detail from the St. Vincent Panels by Nuno Gonçalves, often believed to be a portrait of John of Reguengos, the Constable Prince.
Born	(1400-01-13)13 January 1400 Santarém, Kingdom of Portugal
Died	18 October 1442(1442-10-18) (aged 42) Alcácer do Sal, Kingdom of Portugal
Burial	Batalha Monastery
Spouse	Isabella of Braganza
Issue details	Diogo, Constable of Portugal Isabella of Portugal, Queen of Castile Infanta Beatrice, Duchess of Viseu
House	House of Aviz
Father	John I of Portugal
Mother	Philippa of Lancaster
Religion	Roman Catholicism

Infante John, Constable of Portugal (Template:Lang-pt,Template:IPA-pt; Santarém, 13 January 1400 – 18 October 1442, Alcácer do Sal) was a Portuguese infante (prince) of the House of Aviz, Constable of Portugal and master of the Portuguese Order of St. James (Santiago). In Portugal, he is commonly referred to as the O Infante Condestável ("the Constable Prince").

Early life

Infante John was the son of King John I of Portugal and his wife Philippa of Lancaster. John and his brothers Edward, Peter, Henry and Ferdinand, sister Isabella and half-brother Afonso, constitute what Portuguese historians have traditionally labelled the 'illustrious generation' (Ínclita Geração)

Royal career

With his brothers, Infante John participated in the conquest of Ceuta (1415) and was knighted by his father in the aftermath. He was invested as the 1st Lord of Reguengos de Monsaraz, Colares and Belas shortly after. In October 1418, at the king's request, Pope Martin V approved the appointment of Infante John as the 10th Master of the Order of St. James, bringing the old military order into the hands of the royal family. That same year (1418), John and his brother Henry led a relief fleet to Ceuta, and helped lift the Moroccan-Granadan siege.

After the death of Nuno Álvares Pereira in 1431, Infante John was appointed the 3rd Constable of Portugal. As a result, John is frequently characterized by the appellation O Infante Condestável ("The Constable Prince").

After King John I's death in 1433, John's eldest brother ascended as king Edward of Portugal. In 1437, Infante John joined another brother Peter, Duke of Coimbra in arguing against a projected Portuguese expedition to seize Tangier. The campaign ended in disaster. After the Tangier fiasco, John urged the ratification of the treaty with Marinid Morocco, delivering Ceuta in exchange for his captive brother Ferdinand, the Saint Prince. The Cortes refused, leaving Ferdinand to die in captivity.

Duke of Coimbra Rebellion

King Edward died in September 1438, leaving a young son to ascend as king Afonso V of Portugal, under the regency of his widow Eleanor of Aragon. This was an unpopular arrangement among the common people of the country, who feared Eleanor would be a puppet of the high nobility, who were itching to claw back the losses they incurred since the revolution of the 1380s. The prospect of civil war raised its head. To forestall a rebellion, Infante John quickly seized control of Lisbon, and oversaw the assembly of a burgher-packed Cortes to elect his brother Peter of Coimbra as regent for his nephew Afonso V. The high nobility, led by half-brother Afonso of Barcelos, urged Eleanor to hold fast, and a tense power-sharing regency arrangement was agreed upon between Peter and Eleanor.

Peter of Coimbra relied on his close alliance with Infante John to secure the lion's share of power during the first few years of the regency. Infante John's sudden death in October 1442 was a terrible blow to Peter, who thereafter found it increasingly difficult to fend off the aspirations of half-brother Afonso of Barcelos.

Regent Peter appointed John's son Diogo of Portugal to succeed his father as Master of the Order of Santiago and Constable of Portugal.

Marriage and Issue

In 1424, John married his half-niece Isabella of Braganza, Lady of Reguengos de MonsarazIsabella of Braganza, daughter of his half-brother Afonso of Barcelos. The couple had four children:

• Diogo, Constable of Portugal (1425-1443)
• Isabella of Portugal, Queen of Castile (1428-1496), married John II of Castile, mother of Isabella I of Spain
• Infanta Beatrice, Duchess of Viseu (1430-1506), married Infante Fernando, Duke of Viseu, mother of Manuel I of Portugal
• Filipa, Lady of Almada (1432-ca.1450)

Ancestry

References

1. Bull of Pope Martin V appointing John master of Santiago can be found in Monumenta Henricina, vol. 2, p.301

"Nobreza de Portugal e do Brasil" – Vol. I, pages 296-297. Published by Zairol Lda., Lisbon 1989.

v t e House of Aviz
João I (1385–1433) Spouse(s) Philippa of Lancaster Children Duarte I Peter, Duke of Coimbra Henry the Navigator Isabella, Duchess of Burgundy John, Constable of Portugal Ferdinand the Holy Prince
Duarte I (1433–1438) Spouse(s) Eleanor of Aragon Children Afonso V Ferdinand, Duke of Viseu Eleanor, Holy Roman Empress Catherine Joan, Queen of Castile
Afonso V (1438–1481) Spouse(s) Isabel of Coimbra Joanna la Beltraneja Children John, Prince of Portugal Joanna João II
João II (1481–1495) Spouse(s) Eleanor of Viseu Children Afonso, Prince of Portugal
Manuel I (1495–1521) Spouse(s) Isabella of Aragon Maria of Aragon Eleanor of Austria Children Miguel da Paz, Prince of Portugal João III Isabella, Holy Roman Empress Beatrice, Duchess of Savoy Louis, Duke of Beja Ferdinand, Duke of Guarda Cardinal-Infante Afonso Henrique I Edward, Duke of Guimarães Maria, Duchess of Viseu
João III (1521–1557) Spouse(s) Catherine of Austria Children Afonso, Prince of Portugal Maria Manuela, Princess of Asturias Manuel, Prince of Portugal Filipe, Prince of Portugal João Manuel, Prince of Portugal
Sebastião I (1557–1578)
Henrique I (1578–1580)
Notes The House of Aviz is a cadet branch of the House of Burgundy and was succeeded by the House of Habsburg

Template:Persondata

• Use dmy dates from August 2013
• Portuguese infantes
• House of Aviz
• 1400 births
• 1442 deaths
• People from Santarém Municipality
• 15th-century Portuguese people