Mona Hopton Bell
Mona Hopton Bell( 1867- 1940) was a British artist, best known for her portraits of civic figures.
She was the grandmother of the painter Jean H. Bell.
Blanche of Portugal (1259–1321)
Blanche of Portugal (25 February 1259 in Santarém, – 17 April 1321 in Burgos; Branca in Portuguese and Blanca in Spanish), was an "infanta", the firstborn child of King Afonso III of Portugal and his second wife Beatrice of Castile.
Named after her great-aunt Blanche of Castile, queen of France, Blanche was the Lady of Las Huelgas, Montemor-o-Velho, Alcocer and Briviesca, the city which she founded.
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.
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.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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.
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.
Afonso III of Portugal
Afonso III (rare English alternatives: "Alphonzo" or "Alphonse"), or "Affonso" (Archaic Portuguese), "Alfonso" or "Alphonso" (Portuguese-Galician) or "Alphonsus" (Latin), the Boulonnais (Port. "
o Bolonhês"), King of Portugal (5 May 121016 February 1279) was the first to use the title "King of Portugal and the Algarve", from 1249.
He was the second son of King Afonso II of Portugal and his wife, Urraca of Castile; he succeeded his brother, King Sancho II of Portugal, who died on 4 January 1248.
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.

Question: Who is Blanche Of Portugal (1259–1321)'s paternal grandmother?
Answer: Urraca of Castile