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Denis of Portugal
Lord of Villar-Dompardo
Lord of Cifuentes, Escalona y Alvar de Tormes
Coimbra, Kingdom of Portugal
Diedc. 1403
Crown of Castile
BuriedSanta María de Guadalupe Monastery
FamilyPortuguese House of Burgundy
SpouseJoan of Castile, Lady of Cifuentes
FatherPeter I
MotherInês de Castro

Denis of Portugal (Portuguese: 'Dinis' or 'Diniz' [diˈniʃ]), occasionally surnamed Castro[2] (1353 – c. 1403), was an infante of Portugal. He was the son of Portuguese King Peter I and a Galician noblewoman named Inês de Castro who had arrived in Portugal as a maid of princess Constance of Castile, recently married to Pedro I (Heir Prince at the time).


Considering Denis 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.

After the death of his mother Denis left Portugal to Castile with his brother but during the 1383–85 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 John (his brother). Although he managed to be acclaimed King in the city of Santarém 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 John.


He married in 1372 Joan of Castile, 2nd? Lady of Cifuentes, born c. 1360, illegitimate daughter of Henry II of Castile by Juana, 1st? Lady of Cifuentes, born c. 1340, from whom he had two sons and a daughter:

He died in about 1403.[3]


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  1. ^ Rodrigues Oliveira 2010, p. 262.
  2. ^ Fernandes 2006, p. 268 fn. 30.
  3. ^ a b Olivera Serrano 2005, p. 130.


  • Fernandes, Fátima Regina (2006). "Estratégias de Legitimação Linhagística em Portugal nos Séculos XIV e XV" (PDF). Revista da Faculdade de Letras: História. III (in Portuguese). Vol. 7. University of Porto. pp. 263–284. ISSN 0871-164X. Archived (PDF) from the original on 7 January 2014.
  • Olivera Serrano, César (2005). Beatriz de Portugal: La pugna dinástica Avís-Trastámara (PDF) (in Spanish). ISBN 978-84-00-08343-4. Archived (PDF) from the original on 13 March 2011.
  • Rodrigues Oliveira, Ana (2010). Rainhas medievais de Portugal. Dezassete mulheres, duas dinastias, quatro séculos de História (in Portuguese). Lisbon: A esfera dos livros. ISBN 978-989-626-261-7.