Gerloc
Gerloc (or Geirlaug), baptised in Rouen as Adela (or Adèle) in 912, was the daughter of Rollo, of Normandy, Count of Rouen, and his wife, Poppa of Bayeux.
She was the sister of William I Longsword of Normandy.
In 935, she married William Towhead, the future Count of Poitou and Duke of Aquitaine.
They had two children together before she died on 14 October 962:
Fred Le Deux
Frederick" Fred" Le Deux( born 4 December 1934) was an Australian rules footballer who played with Geelong in the Victorian Football League( VFL).
He is the grandfather of Tom Hawkins.
Adelaide of Rheinfelden
Adelaide of Rheinfelden( or Adelaide of Swabia)( 1060s – May 1090), was Queen Consort of Hungary by marriage to King Ladislaus I of Hungary.
Henry Krause
Henry J." Red" Krause, Jr.( August 28, 1913 – February 20, 1987) was an American football offensive lineman in the National Football League for the Brooklyn Dodgers and the Washington Redskins.
He played college football at St. Louis University.
He is the grandfather of Jennifer Krause
He is the great grandfather of Payton Hoeing
Adelaide of Aquitaine
Adbelahide or Adele or Adelaide of Aquitaine (or Adelaide of Poitiers)
(c. 945 or 952 – 1004), was queen consort of France by marriage to Hugh Capet.
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.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Philippa, Countess of Toulouse
Philippa( c. 1073 – 28 November 1118) was" suo jure" Countess of Toulouse, as well as the Duchess of Aquitaine by marriage to Duke William IX of Aquitaine.
Emma of Blois
Emma of Blois( 950–27 December 1003) was Duchess consort of Aquitaine by marriage to William IV, Duke of Aquitaine.
She ruled Aquitaine as regent for her son, William V, Duke of Aquitaine, from 996 until 1004.
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.

Question: Who is the maternal grandfather of Adelaide Of Aquitaine?
Answer: Rollo