Isabella of Braganza also known as Isabella of Barcelos (her father was originally the 8th Count of Barcelos

Count of Barcelos

Count of Barcelos is a title of nobility, the first to be granted in Portugal. It was created in 1298 by king Denis I and initially it was a non hereditary title, although most of the holders belonged to the Teles de Menezes family...

). She was the daughter of Afonso, 1st Duke of Braganza

Afonso, 1st Duke of Braganza

Dom Afonso I, the 1st Duke of Braganza was the eighth Count of Barcelos, the 2nd Count of Neiva, 2nd Lord of Faria and the first Duke of Braganza.-Origins:...

 and Beatriz Pereira de Alvim, she married Infante João, Lord of Reguengos de Monsaraz, her half-uncle, son of John I of Portugal

John I of Portugal

John I KG , called the Good or of Happy Memory, more rarely and outside Portugal the Bastard, was the tenth King of Portugal and the Algarve and the first to use the title Lord of Ceuta...

.

Issue

Isabella and Infante John had four children:

• Infante Diogo of Portugal
  Diogo of Portugal
  Diogo of Portugal was a Portuguese infante, son of John, Lord of Reguengos de Monsaraz, infante of Portugal, and of his wife Isabella of Braganza...
  
   (1425-1433) - 4th Constable
  Constable
  A constable is a person holding a particular office, most commonly in law enforcement. The office of constable can vary significantly in different jurisdictions.-Etymology:...
  
   and 11th Master of the Order of St. James;
• Infanta Isabella of Portugal (1428-1496), who was the mother of Isabella I of Castile
  Isabella I of Castile
  Isabella I was Queen of Castile and León. She and her husband Ferdinand II of Aragon brought stability to both kingdoms that became the basis for the unification of Spain. Later the two laid the foundations for the political unification of Spain under their grandson, Charles V, Holy Roman Emperor...
  
   and an ancestor of Spanish, French and English monarchs;
• Infanta Beatrice of Portugal
  Beatriz of Portugal (1430-1506)
  Infanta Beatriz of Portugal was a Portuguese infanta daughter of Infante João, Lord of Reguengos and Isabella of Braganza a daughter of Afonso, 1st Duke of Braganza.-Biography:Due to the Aviz dynasty marriage policy, Beatrice was 1st cousin and sister-in-law of king Afonso V of Portugal,...
  
  , the mother of Manuel I of Portugal
  Manuel I of Portugal
  Manuel I , the Fortunate , 14th king of Portugal and the Algarves was the son of Infante Ferdinand, Duke of Viseu, , by his wife, Infanta Beatrice of Portugal...
  
  , Isabella of Viseu
  Isabella of Viseu
  Isabella of Viseu was a daughter of Infante Fernando, Duke of Viseu and his wife and cousin Infanta Beatrice, Duchess of Viseu. She was a member of the House of Aviz and later, House of Braganza.-Family:...
  
   and Eleanor of Viseu, and an ancestor of Spanish and Portuguese monarchs:
• Infanta Phillipa of Portugal (1432-1444), Lady of Almada
  Almada
  Almada is a municipality in Portugal, covering an area of 70.2 km² located on the southern margin of the Tagus River. Its municipal population in 2008 was 164,844 inhabitants; the urbanized center had a population of 102,357.The seat is the city of Almada....
  
  

Isabella died in the town of Arévalo

Arévalo

Arévalo is a municipality in Spain, it is situated in the province of Ávila and is part of the autonomous community of Castile and León. The name came from Celtic word arevalon, meaning "place near the wall."-Regional importance:...

 on 26 October 1466 at the age of sixty-four.

Ancestry