Beatrice of England
Beatrice of England (25 June 1242 – 24 March 1275) was a member of the House of Plantagenet, the daughter of Henry III of England and Eleanor of Provence.
Aimery I, Viscount of Châtellerault
Aimery I de Châtellerault( – 7 November 1151), was the Viscount of Châtellerault and father of Aenor de Châtellerault.
Through his daughter he was the grandfather of Eleanor of Aquitaine, successively queen of France and England.
Eleanor of England, Queen of Castile
Eleanor of England( c. 1161 – 31 October 1214), was Queen of Castile and Toledo as wife of Alfonso VIII of Castile.
She was the sixth child and second daughter of Henry II, King of England, and Eleanor of Aquitaine.
Blanche of Brittany
Blanche of Brittany( 1271 – 1327) was a daughter of John II, Duke of Brittany, and his wife Beatrice of England.
She is also known as Blanche de Dreux.
Through her mother she was the granddaughter of King Henry III of England and Eleanor of Provence.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
John Westley
Rev. John Westley( 1636 – 78) was an English nonconformist minister.
He was the grandfather of John Wesley( founder of Methodism).
Eleanor of England, Countess of Leicester
Eleanor of England( also called Eleanor Plantagenet and Eleanor of Leicester)( 1215 – 13 April 1275) was the youngest child of John, King of England and Isabella of Angoulême.
Kaya Alp
Kaya Alp was, according to Ottoman tradition, the son of Kızıl Buğa and the father of Suleyman Shah, who was, in turn, the grandfather of Ertuğrul, and the great grandfather of the Ottoman Empire founder, Osman I.
Eleanor of Brittany (abbess)
Eleanor of Brittany (1275 – 16 May 1342) was the sixteenth abbess of Fontevrault.
She was born in England to John II, Duke of Brittany and Beatrice of England, and in 1281 at the age of seven entered Amesbury Abbey, a priory of the Fontevrault order (her first cousin, twice removed, Eleanor, Fair Maid of Brittany is buried there).
In 1290 she moved to Fontevrault Abbey in the Loire region of France, the parent abbey of the order, where she took her vows and became a nun.
The richly illuminated Fontevraud Gradual was presented to her upon her induction.
In 1304 she became abbess.
Upon her death in 1342 she bequeathed the gradual to the abbey.
It survives to this day and is held by the public library of Limoges.

Question: Who is the maternal grandfather of Eleanor Of Brittany (Abbess)?
Answer: Henry III