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.
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.
Marco Torlonia, 6th Prince of Civitella-Cesi
" Don" Marco Alfonso Torlonia, 6th Prince of Civitella- Cesi( 2 July 1937 – 5 December 2014) was the son of Alessandro Torlonia, 5th Prince of Civitella- Cesi and his wife, Infanta Beatriz of Spain, daughter of King Alfonso XIII of Spain.
He was, therefore, first cousin to King Juan Carlos I of Spain.
He was also an uncle to Princess Sibilla of Luxembourg, daughter of his younger sister, Olimpia.
Infanta Beatriz of Spain
Infanta Beatriz of Spain, Princess of Civitella-Cesi ("Doña Beatriz Isabel Federica Alfonsa Eugénie Cristina Maria Teresia Bienvenida Ladislàa de Borbón y Battenberg"; 22 June 1909 – 22 November 2002) was a daughter of King Alfonso XIII of Spain and Victoria Eugenie of Battenberg, wife of Alessandro Torlonia, 5th Prince di Civitella-Cesi.
She was a paternal aunt of King Juan Carlos I.
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.
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.
Beatriz, Duchess of Viseu
Infanta Beatriz of Portugal( 13 June 1430 – 30 September 1506) was a Portuguese infanta, daughter of John, Constable of Portugal( fourth son of King John I of Portugal and his wife Philippa of Lancaster) and Isabella of Barcelos a daughter of Afonso I, Duke of Braganza.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Alfonso XIII of Spain
Alfonso XIII (17 May 1886 – 28 February 1941), also known as El Africano or the African, was King of Spain from 1886 until the proclamation of the Second Republic in 1931.
Alfonso was monarch from birth as his father, Alfonso XII, had died the previous year.
Alfonso's mother, Maria Christina of Austria, served as regent until he assumed full powers on his sixteenth birthday in 1902.
During Alfonso's reign Spain experienced four major problems that contributed to the end of the liberal monarchy: the lack of real political representation of broad social groups; the poor situation of the popular classes, especially peasants; problems arising from the Rif War; and Catalan nationalism.
The political and social turbulence that began with the Spanish–American War prevented the turnaround parties from establishing a true liberal democracy, which led to the establishment of the dictatorship of Miguel Primo de Rivera.
With the political failure of the dictatorship, Alfonso impelled a return to the democratic normality with the intention of regenerating the regime.
Nevertheless, it was abandoned by all political classes, as they felt betrayed by the king's support of the dictatorship of Primo de Rivera.
He left Spain voluntarily after the municipal elections of April 1931, which were taken as a plebiscite on abolishing the monarchy.

Question: Who is the paternal grandmother of Infanta Beatriz Of Spain?
Answer: Maria Christina of Austria