Beatriz, Duchess of Viseu

Infanta Beatriz of Portugal (13 June 1430 – 30 September 1506) was a Portuguese infanta, daughter of John, Constable of Portugal (fourth son of King John I of Portugal and his wife Philippa of Lancaster) and Isabella of Barcelos a daughter of Afonso I, Duke of Braganza.

Infanta Beatrice
Duchess of Viseu
Depiction of Infanta Beatriz in a 1678 portrait in the Convent of Beja
Born13 June 1430
Died30 September 1506 (aged 76)
SpouseInfante Fernando, Duke of Viseu
IssueManuel I of Portugal
Leonor of Viseu
Isabella of Viseu
FatherJohn, Constable of Portugal
MotherIsabella of Barcelos
ReligionRoman Catholicism


Due to the Aviz dynasty marriage policy, Beatrice was 1st cousin and sister-in-law of king Afonso V of Portugal, 2nd cousin and mother-in-law of king John II of Portugal, 1st cousin and mother-in-law of Ferdinand II, 3rd Duke of Braganza and mother of king Manuel I of Portugal, playing an active role in politics during the consecutive reigns of Afonso V, John II and Manuel I.

Through her sister Isabella, wife of John II of Castile, she was an aunt of Isabella I of Castile, helping to settle both the Treaty of Alcáçovas and the Treaty of Terçarias de Moura between the Kingdom of Portugal and the Kingdom of Castile, after meeting with her niece Isabella in person.

She was also predominant in the Order of Santiago, acting as tutor for her son Diogo.

Infanta Beatrice protected and encouraged Gil Vicente, a Portuguese playwright, considered as the father of the Portuguese theatre.

She founded the Religiosas da Conceição monastery, in Beja, where her husband was buried.

Marriage and children

In 1447, Beatrice married her cousin Infante Ferdinand (Portuguese: Fernando), 2nd Duke of Viseu, son of King Edward of Portugal (her uncle). From this marriage, they had ten children:


See also


  1. de Sousa, Antonio Caetano (1735). Historia genealogica da casa real portugueza [Genealogical History of the Royal House of Portugal] (in Portuguese). 2. Lisboa Occidental. p. 167.


  • ”Nobreza de Portugal e do Brasil” – Vol. I, page 298 and 312. Published by Zairol Lda., Lisbon 1989.
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