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.
John, Prince of Antioch
John, Prince of Antioch( 1431 – 1457), was the second son of Infante Peter, Duke of Coimbra, and Isabella of Urgell, Duchess of Coimbra.
Philippa of Coimbra
Infanta Philippa of Coimbra (1437–1497) was the youngest child of Infante Peter, Duke of Coimbra, and Isabella of Aragon, Countess of Urgell.
She became a nun in the Convent of Odivelas where she died in 1497.
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.
Anne Denman
Anne Denman( 1587–1661) was born in Olde Hall, Retford, Nottinghamshire.
Through a fortunate second marriage with Thomas Aylesbury, she became the grandmother of Lady Anne Hyde, Duchess of York and great- grandmother of Queen Mary II and Queen Anne.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
Peter, Duke of Coimbra
Infante D. Pedro, Duke of Coimbra , (9 December 1392 – 20 May 1449) was a Portuguese "infante" (prince) of the House of Aviz, son of King John I of Portugal and his wife Philippa of Lancaster, daughter of John of Gaunt.
In Portugal, he is better known as Infante D. Pedro das Sete Partidas [do Mundo], "of the Seven Parts [of the World]" because of his travels.
Possibly the best-travelled prince of his time
, he was regent between 1439 and 1448.
He was also 1st
Lord of Montemor-o-Velho, Aveiro, Tentúgal, Cernache, Pereira, Condeixa and Lousã.
Kaoru Hatoyama
After the elections of 2009, she became more widely known as the grandmother of Prime Minister Yukio Hatoyama and his politician brother Kunio Hatoyama.
Philippa of Luxembourg
Philippa of Luxembourg( 1252 – 6 April 1311) was the daughter of Count Henry V of Luxembourg and his wife, Marguerite of Bar.
She married John II, Count of Holland.
Two of her granddaughters were Philippa of Hainault, Queen consort of England, and Margaret II, Countess of Hainault in her own right and wife of Holy Roman Emperor Louis IV.
The children of John II of Holland and Philippa of Luxembourg included:

Question: Who is Philippa Of Coimbra's paternal grandmother?
Answer: Philippa of Lancaster