Manuel, Prince of Portugal (1531–1537)
Manuel, Prince of Portugal( 11 November 1531 – 14 April 1537), was the Prince of Portugal from 1535 to his death in 1537.
He was the fifth child son of king John III of Portugal and Catherine of Austria.
In 1535, his father officially designated him as Prince of Portugal, taking the place of his eldest sister Infanta Maria Manuela.
However, after his premature death at five years old, his younger brother Infante Filipe became the next Prince of Portugal.
John, Prince of Portugal (1451)
John, Prince of Portugal  was a Portuguese infante, son of Afonso V and Isabella of Coimbra.
He was born heir to the throne in 1451, but he died young during the same year.
The title of Prince of Portugal then passed again to Infante Ferdinand, Duke of Viseu, his uncle.
Isabella of Aragon, Queen of Portugal
Isabella, Princess of Asturias (2 October 1470 – 23 August 1498) was a Queen consort of Portugal and heir presumptive of King Ferdinand II of Aragon and Queen Isabella I of Castile, as their eldest daughter.
Her younger siblings were John, Prince of Asturias, Queen Joanna I of Castile, Maria, Queen of Portugal and Catherine, Queen of England.
Pedro, Prince of Brazil
Pedro, Prince of Brazil( Lisbon, 19 October
1712 – Lisbon, 29 October 1714) was the second child of John V of Portugal and Maria Ana of Austria.
He was made Prince of Brazil and Duke of Braganza upon his birth.
He died at the age of two, making his brother Joseph( future Joseph I of Portugal) the new Prince of Brazil.
Afonso, Prince of Portugal (1526)
Afonso, Prince of Portugal was the first son of king John III of Portugal and his queen, Catherine of Austria.
He was the Prince of Portugal but died in the same year he was born, in 1526.
Isabel of Coimbra
Infanta Isabel of Coimbra (Isabella of Portugal)
(1 March 1432 – 2 December 1455) was a Portuguese infanta and a queen consort of Portugal as the first spouse of King Afonso V of Portugal.
João Manuel, Prince of Portugal
João Manuel, Prince of Portugal( 3 June 1537 – 2 January 1554) was a Portuguese" infante"( prince), the eighth son of King John III of Portugal by his wife Catherine of Austria, daughter of Philip I of Castile and Joanna of Castile.
As the heir to the throne he was styled Prince of Portugal.
Philip, Prince of Portugal
Filipe, Prince of Portugal( 25 March 1533 – 29 April 1539), was the Prince of Portugal from 1537 to his death in 1539.
He was the sixth child son of king John III of Portugal and Catherine of Austria.
In 1537, he succeeded his brother Prince Manuel as Prince of Portugal, after his premature death.
However, after his own premature death, two years later, after reaching six years old, his younger brother Infante João Manuel became the next Prince of Portugal.
Theodred II (Bishop of Elmham)
Theodred II was a medieval Bishop of Elmham.
The date of Theodred's consecration unknown, but the date of his death was sometime between 995 and 997.
John I, Prince of Anhalt-Bernburg
John I, Prince of Anhalt- Bernburg( died 5 June 1291) was a German prince of the House of Ascania and ruler of the principality of Anhalt- Bernburg.
He was the eldest son of Bernhard I, Prince of Anhalt- Bernburg, by his wife Princess Sophie, daughter of King Abel of Denmark.

Question: What is the date of death of John, Prince Of Portugal (1451)'s mother?
Answer: 2 December 1455