Infante John, Constable of Portugal (, ; 13 January 1400 – 18 October 1442) was a Portuguese ''

infante Infante (, ; f. ''infanta''), also anglicised as "infant" or translated as "prince", is the title and rank given in the Iberian kingdoms of Spain (including the predecessor kingdoms of Aragon, Castile, Navarre, and León) and Portugal to the ...

'' (prince) of the

House of Aviz The House of Aviz (Portuguese language, Portuguese: ''Casa de Avis'' ), also known as the Joanine Dynasty (''Dinastia Joanina''), was a dynasty of Portuguese people, Portuguese origin which flourished during the Portuguese Renaissance, Renaissanc ...

Constable of Portugal Constable of Portugal ({{langx, pt, Condestável de Portugal) was an office created by King Ferdinand I of Portugal in 1382, to replace the High Standard-bearer ('' Alferes-Mor'') as the head of the Portuguese Military. It was also referred as the ...

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 King is a royal title given to a male monarch. A king is an Absolute monarchy, absolute monarch if he holds unrestricted Government, governmental power or exercises full sovereignty over a nation. Conversely, he is a Constitutional monarchy, ...

John I of Portugal John I ( WP:IPA for Portuguese, �uˈɐ̃w̃ 11 April 1357 – 14 August 1433), also called John of Aviz, was King of Portugal from 1385 until his death in 1433. He is recognized chiefly for his role in Portugal's victory in 1383–85 crisi ...

and his wife

Philippa of Lancaster Philippa of Lancaster ( ; 31 March 1360 – 19 July 1415) was Queen of Portugal from 1387 until 1415 as the wife of King John I. Born into the royal family of England, her marriage secured the Treaty of Windsor and produced several children ...

. John and his brothers

Edward Edward is an English male name. It is derived from the Anglo-Saxon name ''Ēadweard'', composed of the elements '' ēad'' "wealth, fortunate; prosperous" and '' weard'' "guardian, protector”. History The name Edward was very popular in Anglo-S ...

Peter Peter may refer to: People * List of people named Peter, a list of people and fictional characters with the given name * Peter (given name) ** Saint Peter (died 60s), apostle of Jesus, leader of the early Christian Church * Peter (surname), a su ...

Henry Henry may refer to: People and fictional characters * Henry (given name), including lists of people and fictional characters * Henry (surname) * Henry, a stage name of François-Louis Henry (1786–1855), French baritone Arts and entertainmen ...

and

Ferdinand Ferdinand is a Germanic name composed of the elements "journey, travel", Proto-Germanic , abstract noun from root "to fare, travel" (PIE , "to lead, pass over"), and "courage" or "ready, prepared" related to Old High German "to risk, ventu ...

, sister

Isabella Isabella may refer to: People and fictional characters * Isabella (given name), including a list of people and fictional characters * Isabella (surname), including a list of people Places United States * Isabella, Alabama, an unincorpo ...

and half-brother

Afonso Afonso is the Portuguese and Galician form of Alphons. Middle Ages Iberian royal families ;Portugal *Afonso I of Portugal (1109–1185) *Afonso II of Portugal (1185–1223) *Afonso III of Portugal (1210–1279) *Afonso IV of Portugal (1291� ...

, constitute what Portuguese historians have traditionally labelled the '

illustrious generation The ''Ínclita Geração'' (often translated in English as "Illustrious Generation") is a term commonly used by Portuguese historians to refer to a group of 15th-century '' infantes'' (princes) of the House of Aviz, specifically the sons of King ...

' (''Ínclita Geração'')

Royal career

He was invested as the 1st Lord of

Reguengos de Monsaraz Reguengos de Monsaraz (), officially the Municipality of Reguengos de Monsaraz (), is a municipality in Évora District in Portugal. The population in 2011 was 10,828, in an area of 464.00 km2. The City of Reguengos de Monsaraz proper has a po ...

, Colares and Belas shortly after. In October 1418, at the king's request,

Pope Martin V Pope Martin V (; ; January/February 1369 – 20 February 1431), born Oddone Colonna, was the head of the Catholic Church and ruler of the Papal States from 11 November 1417 to his death in February 1431. His election effectively ended the We ...

approved the appointment of Infante John as the 10th Master of the

Order of St. James of the Sword The Military Order of Saint James of the Sword (), formerly known as the Ancient, Most Noble and Enlightened Military Order of Saint James of the Sword, of the Scientific, Literary and Artistic Merit (), is one of the four former ancient Port ...

, bringing the old military order into the hands of the royal family.Bull of

appointing John master of Santiago can be found in ''Monumenta Henricina'', vol. 2
p.301
/ref> That same year (1418), John and his brother

Henry the Navigator Princy Henry of Portugal, Duke of Viseu ( Portuguese: ''Infante Dom Henrique''; 4 March 1394 – 13 November 1460), better known as Prince Henry the Navigator (), was a Portuguese prince and a central figure in the early days of the Portuguese ...

led a relief fleet to Ceuta and helped lift the Siege of Ceuta. After the death of

Nuno Álvares Pereira '' Dom'' Nuno Álvares Pereira, OCarm (; 24 June 1360 – 1 November 1431) was a very successful Portuguese general who had a decisive role in the 1383–1385 Crisis that assured Portugal's independence from Castile. He later became a my ...

in 1431, Infante John was appointed the 3rd

. As a result, John is frequently characterised by the appellation ''O Infante Condestável'' ("The Constable Prince"). After King John I's death in 1433, John's eldest brother ascended the throne as king

Edward of Portugal Edward ( ; 31 October 1391 – 9 September 1438), also called Edward the Philosopher King (''Duarte o Rei-Filósofo'') or the Eloquent (''o Eloquente''), was the King of Portugal from 1433 until his death. He was born in Viseu, the son of John I o ...

. In 1437, Infante John joined another brother

Peter, Duke of Coimbra Dom Peter, Duke of Coimbra, KG ( ; 9 December 1392 – 20 May 1449) was a Portuguese ''infante'' (prince) of the House of Aviz, son of King Dom John I of Portugal and his wife, Philippa of Lancaster, daughter of John of Gaunt. In Portugal, h ...

, in arguing against a projected Portuguese expedition to seize Tangier that led to the Battle of Tangier. The campaign ended in disaster. After the Tangier fiasco, John urged the ratification of a treaty with

Marinid The Marinid dynasty ( ) was a Berber Muslim dynasty that controlled present-day Morocco from the mid-13th to the 15th century and intermittently controlled other parts of North Africa (Algeria and Tunisia) and of the southern Iberian Peninsula ...

Morocco that called for the relinquishment of

Ceuta Ceuta (, , ; ) is an Autonomous communities of Spain#Autonomous cities, autonomous city of Spain on the North African coast. Bordered by Morocco, it lies along the boundary between the Mediterranean Sea and the Atlantic Ocean. Ceuta is one of th ...

in exchange for his captive brother

Ferdinand the Holy Prince Ferdinand the Holy Prince (; ; 29 September 1402 – 5 June 1443), sometimes called the "Saint Prince" or the "Constant Prince", was an ''infante'' of the Kingdom of Portugal. He was the youngest of the "Illustrious Generation" of 15th-century Po ...

. The Cortes refused, and Ferdinand was left to die in captivity.

Duke of Coimbra Rebellion

King Edward died in September 1438, leaving a young son to ascend the throne as king

Afonso V of Portugal Afonso V (; 15 January 1432 – 28 August 1481), known by the sobriquet the African (), was King of Portugal from 1438 until his death in 1481, with a brief interruption in 1477. His sobriquet refers to his military conquests in Northern Africa. ...

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 sought to recover the political privileges they lost during the revolution of the 1380s. The prospect of civil war raised its head. To forestall a rebellion, Infante John quickly seized control of

Lisbon Lisbon ( ; ) is the capital and largest city of Portugal, with an estimated population of 567,131, as of 2023, within its administrative limits and 3,028,000 within the Lisbon Metropolitan Area, metropolis, as of 2025. Lisbon is mainlan ...

and oversaw the assembly of a burgher-packed

Cortes Cortes, Cortés, Cortês, Corts, or Cortès may refer to: People * Cortes (surname), including a list of people with the name ** Hernán Cortés (1485–1547), a Spanish conquistador Places * Cortes, Navarre, a village in the South border of ...

to elect his brother

Peter of Coimbra Dom (honorific), Dom Peter, Duke of Coimbra, Order of the Garter, KG ( ; 9 December 1392 – 20 May 1449) was a Infante of Portugal, Portuguese ''infante'' (prince) of the House of Aviz, son of King Dom John I of Portugal and his wife, Philippa ...

as regent for his nephew Afonso V. The high nobility, led by his half-brother

Afonso of Barcelos Dom Afonso I of Braganza (; 10 August 1377 – 15 December 1461) was the first duke of Braganza and the eighth count of Barcelos. He founded the House of Braganza, the most powerful and wealthy dynasty in Portugal. His descendants became high-ra ...

, 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 his 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 Barcelos, daughter of his half-brother

. The couple had four children: *Infante Diogo of Portugal (1425–1443) – 4th

and 11th Master of the Order of St. James; without issue. *Infanta

Isabella of Portugal Isabella of Portugal (; 24 October 1503 – 1 May 1539) was the empress consort of Charles V, Holy Roman Emperor, King of Spain, Archduke of Austria, and Duke of Burgundy. She was Queen of Spain and Germany, and Lady of the Netherlands fr ...

(1428–1496), married

John II of Castile John II of Castile (; 6 March 1405 – 20 July 1454) was King of Castile and León from 1406 to 1454. He succeeded his older sister, Maria of Castile, Queen of Aragon, as Prince of Asturias in 1405. Regency John was the son of King Henry ...

, mother of

Isabella I of Castile Isabella I (; 22 April 1451 – 26 November 1504), also called Isabella the Catholic (Spanish: ''Isabel la Católica''), was Queen of Castile and List of Leonese monarchs, León from 1474 until her death in 1504. She was also Queen of Aragon ...

. *Infanta

Beatrice of Portugal Beatrice (, ; 7–13 February 1373 – ) was the only surviving legitimate child of King Ferdinand I of Portugal and his wife, Leonor Teles. She became Queen consort of Castile by marriage to King John I of Castile. Following her father's d ...

(1430–1506), married

Infante Ferdinand, Duke of Viseu Infante Ferdinand, Duke of Viseu and Beja (or ''Fernando,'' , 17 November 1433 – 18 September 1470) was the third son of Edward, King of Portugal and his wife Eleanor of Aragon. Biography Ferdinand was born in Almeirim on 17 November 14 ...

, mother of

Manuel I of Portugal Manuel I (; 31 May 146913 December 1521), known as the Fortunate (), was King of Portugal from 1495 to 1521. A member of the House of Aviz, Manuel was Duke of Beja and Viseu prior to succeeding his cousin, John II of Portugal, as monarch. Manu ...

. *Infanta Phillipa of Portugal (1432–1444), Lady of

Almada Almada () is a city and a municipality in Portugal, located on the southern margin of the Tagus River, on the opposite side of the river from Lisbon. The two cities are connected by the 25 de Abril Bridge. The population of the municipality in 20 ...

Ancestry

References

"Nobreza de Portugal e do Brasil" – Vol. I, pages 296–297. Published by Zairol Lda., Lisbon 1989. {{DEFAULTSORT:John, Constable of Portugal 1400 births 1442 deaths 15th-century Portuguese people Constables of Portugal House of Aviz People from Santarém, Portugal Portuguese infantes Portuguese people of English descent Sons of kings