Infanta María de la Paz of Spain
Infanta María de la Paz of Spain ("María de la Paz de Borbón y Borbón"
; Madrid, 23 June 1862 – Schloss Nymphenburg, Munich, 4 December 1946) was an infanta of Spain.
A daughter of Queen Isabella II of Spain, she married her first cousin Prince Ludwig Ferdinand of Bavaria.
She lived for the rest of her life in Germany, dedicating her time to her family, charity work and writing poetry.
She wrote a book of memoirs: "Through Four Revolutions: 1862–1933".
Prince Ferdinand of Bavaria
Infante Ferdinand of Bavaria
(Ferdinand Maria Ludwig Franz von Assisi Isabellus Adalbert Ildefons Martin Bonifaz Joseph Isidro; 10 May 1884 – 5 April 1958) was a Spanish prince, the eldest son and child of Ludwig Ferdinand of Bavaria and his wife, Infanta María de la Paz of Spain.
Ferdinand became an Infante of Spain on 20 October 1905 and renounced his rights to the throne of the Kingdom of Bavaria in 1914.
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.
Princess Pilar of Bavaria
Princess Pilar of Bavaria(" Maria del Pilar Eulalia Antonia Isabella Ludovika Franziska Josepha Rita Euphrasia von Wittelsbach, princess of Bavaria")
( March 13, 1891 – January 29, 1987) was the only daughter of Prince Ludwig Ferdinand of Bavaria and his wife Infanta Maria de la Paz of Spain.
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.
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.
Princess Maria Elisabeth of Bavaria
Princess Maria Elisabeth of Bavaria( 9 September 1914 – 13 May 2011) was the eldest daughter of Prince Franz of Bavaria, third son of Ludwig III of Bavaria.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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 Prince Ferdinand Of Bavaria's maternal grandmother?
Answer: Isabella II of Spain