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.
Beatrice of Coimbra
Infanta Beatrice of Coimbra (1435–1462) was the 5th child of Infante Peter, Duke of Coimbra, and Isabella of Urgell.
After the battle of Alfarrobeira, where her father's army was defeated by the Portuguese royal army, she left the country and took refuge in Burgundy, under her aunt
’s protection:
Isabella of Portugal was married to Duke Philip III the Good.
In 1453, Beatrice married Adolph of Cleves, Lord of Ravenstein, nephew of the Duke Philip III the Good.
They had issue:
She died in Bruges of suspected poisoning in 1462.
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.
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.
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.
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.
Beatrice of Portugal, Duchess of Savoy
Infanta Beatrice of Portugal( 31 December 1504 – 8 January 1538) was Duchess of Savoy by marriage to Charles III, Duke of Savoy.
She was the Sovereign Countess of Asti from 1531 to 1538.
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.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.

Question: Who is the paternal grandmother of Beatrice Of Coimbra?
Answer: Philippa of Lancaster