Elizabeth FitzHugh
Elizabeth FitzHugh( 1455/65- before 10 July 1507) was an English noblewoman.
She is best known for being the grandmother of Catherine Parr, sixth queen consort to Henry VIII, and her siblings Anne Herbert, Countess of Pembroke, and William Parr, 1st Marquess of Northampton.
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Eleanor of Aragon, Queen of Portugal
Eleanor of Aragon (2 May 1402 – 19 February 1445) was queen consort of Portugal as the spouse of Edward I of Portugal and the regent of Portugal as the guardian of her son.
She was the daughter of Ferdinand I of Aragon and Eleanor of Alburquerque.
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.
Diana Guardato
Diana Guardato was a member of the aristocratic Patrician Guardato family, and had three children with King Ferdinand I: Diana Guardato is the 16th- Great Grandmother of His Royal Highness Albert II of Belgium, 15th- Great Grandmother of His Majesty Juan Carlos
I of Spain, 17th- Great Grandmother of Philippe of Belgium, 14th- Great Grandmother of His Majesty Manuel II of Portugal, 16th- Great Grandmother of Grand Duke Henri, as well as many others.
Catherine of Portugal (nun)
The Infanta Catarina (1436–1463);  was a Portuguese "infanta" (princess), daughter of King Edward of Portugal and his wife Eleanor of Aragon.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
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.
Tjuyu
Tjuyu( sometimes transliterated as Thuya or Thuyu) was an Egyptian noblewoman and the mother of queen Tiye, and the wife of Yuya.
She is the grandmother of Akhenaten, and great grandmother of Tutankhamun.

Question: Who is Catherine Of Portugal (Nun)'s maternal grandmother?
Answer: Eleanor of Alburquerque