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). Peter and Inês were not married at the time of Denis birth but Peter had him and his siblings legitimized once he became king.
History
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.
Family
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, by whom he had:
Pedro de Portugal, called «de Colmenarejo»,[3] married to María de Toledo, daughter of Fernando Álvarez de Toledo el Viejo, 1st Lord of Higares[4] and Teresa Vázquez de Ayala,[5] 3rd Lady of Pinto;
Beatriz de Portugal (died 1470),[6] unmarried and without issue.
Illegitimate children:
Fernando de Portugal,[7]Comendador of Oreja, married to María de Torres, daughter of Fernán Ruiz de Torres and Inés de Solier;[7][8]
Rodrigues Oliveira, Ana (2010). Rainhas medievais de Portugal. Dezassete mulheres, duas dinastias, quatro séculos de História (in Portuguese). Lisbon: A esfera dos livros. ISBN978-989-626-261-7.
Caviró Martínez, Balbina (2018). Las "magníficas señoras" y los linajes toledanos (in Spanish). Madrid: Ediciones Hidalguía. ISBN978-84-947842-6-2.
Molina Martínez, Miguel (1983). Andalucía y América en el siglo XVI: Actas de las II Jornadas de Andalucía y América (volume II) (in Spanish). Seville: Escuela de estudios hispano-americanos. ISBN84-00-05666-3.
* also an infante of Castile and León, Aragon, Sicily and Naples,§ also an infante of Spain and an archduke of Austria,# also an infante of Spain,‡ also an imperial prince of Brazil,¶ also a prince of Saxe-Coburg and Gotha, Duke in Saxony,◙ also a prince of Braganza,¤ title removed in 1920 as their parents' marriage was deemed undynastic,ƒ claimant infante