Infante João, Duke of Valencia de Campos

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Portuguese Royalty
House of Burgundy

Afonso Henriques (Afonso I)
Children include Infanta Mafalda Infanta Urraca, Queen of Léon Infante Sancho (future Sancho I) Infanta Teresa, Countess of Flanders and Duchess of Burgundy
Sancho I
Children include Infanta Teresa, Queen of Castile Infanta Sancha, Lady of Alenquer Infanta Constança Infante Afonso (future Afonso II) Infante Pedro, Count of Urgell Infante Fernando, Count of Flanders Infanta Branca, Lady of Guadalajara Infanta Berengária, Queen of Denmark Infanta Mafalda, Queen of Castile
Afonso II
Children include Infante Sancho (future Sancho II) Infante Afonso, Count of Boulogne (future Afonso III) Infanta Leonor, Queen of Denmark Infante Fernando, Lord of Serpa
Sancho II
Afonso III
Children include Infanta Branca, Viscountess of Huelgas Infante Dinis (future Denis I) Infante Afonso, Lord of Portalegre Infanta Maria Infanta Sancha
Denis
Children include Infanta Constança, Queen of Castile Infante Afonso (future Afonso IV)
Afonso IV
Children include Infanta Maria, Queen of Castile Infante Pedro (future Peter I) Infanta Leonor, Queen of Aragon
Peter I
Children include Infanta Maria, Marchioness of Tortosa Infante Fernando (future Ferdinand I) Infanta Beatriz, Countess of Alburquerque Infante João, Duke of Valencia de Campos Infante Dinis, Lord of Villar-Dompardo John, Grand Master of the Order of Aviz (future John I) (natural son)
Ferdinand I
Children include Infanta Beatrice, Queen of Castile and Leon (future Beatrice I of Portugal)
Beatrice (disputed queen)
Children include Infante Miguel of Castile and Portugal

Infante João of Portugal (pronounced [ʒuˈɐ̃ũ]; English: John) (1349-1387) was the son of Portuguese King Peter I and a Castilian noblewoman named Inês de Castro that had arrived in Portugal as a maid of Infanta Constance of Castile, recently married to Pedro I (Heir Prince at the time).

Considering João an Infante of Portugal is a debatable subject. Some historians consider him a natural son of Peter I, so the title Infante of Portugal could never be attributed to him. Other opinions refer that after the death of Inês de Castro, ordered by Pedro's father King Afonso IV of Portugal, the Prince after inheriting the throne admitted that he had married Inês secretly, and because of that she was a lawful Queen of Portugal.

Of Inês de Castro Peter I had two sons and a daughter:

(Infanta) Beatrice of Portugal (1347-1381)
(Infante) John of Portugal (1349-1387)
(Infante) Denis of Portugal (1354-1397)

After the death of his mother John left Portugal to Castile with his brother but during the 1383-1385 Crisis he was one of the claimants to the throne along with Beatrice of Portugal (his niece), John, Master of Aviz (his half-brother) and Dinis (his brother).

His connections with Castile eventually lost him the throne and at the time of the Battle of Aljubarrota he was already out of the country like his brother Denis.

He married twice. The first marriage was with a Castilian noblewoman Maria Teles de Menezes. The second was with Constance of Castile, lady of Alba de Tormes.

From his first marriage he had one son: