Princess Béatrice of Bourbon-Two Sicilies
Princess Béatrice Marie Caroline Louise Françoise of Bourbon-Two Sicilies (born 16 June 1950 in Saint-Raphaël, Var, France) is the eldest daughter of Prince Ferdinand, Duke of Castro, Castro-line claimant to the headship of the House of Bourbon-Two Sicilies, and his wife, Chantal de Chevron-Villette.
Her younger brother, Prince Carlo, Duke of Castro, is the current Castro-line claimant to the headship of the House of Bourbon-Two Sicilies.
Since 2014, Béatrice has served as Grand Chancellor of the Sacred Military Constantinian Order of Saint George.
Hüma Hatun
Hüma Hatun (1410 ‒ September 1449) was the fourth wife of Ottoman Sultan Murad II and mother of Mehmed II and the grandmother of Bayezid II.
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.
Gülbahar Hatun (wife of Mehmed II)
Gülbahar Hatun( 1432 – 1492) was the consort of Sultan Mehmed II, and mother of Sultan Bayezid II of the Ottoman Empire and the grandmother of Selim I.
Princess Caroline Napoléon
Princess Caroline Marie Constance Napoléon (born 24 October 1980) is a member of the House of Bonaparte, which reigned as Emperors of the French twice during the 19th century.
She is the first child and eldest daughter of Prince Charles Napoléon and his first wife, Princess Béatrice of Bourbon-Two Sicilies.
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.
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.

Question: Who is Princess Caroline Napoléon's maternal grandmother?
Answer: Chantal de Chevron-Villette