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.
Henry IV, Duke of Mecklenburg
Henry IV, Duke of Mecklenburg( 1417 – 9 March 1477) was from 1422 to 1477 Duke of Mecklenburg.
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.
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.
William IV, Duke of Aquitaine
William IV (937 – 3 February 994), called Fierebras or Fierebrace (meaning "Proud Arm", from the French "Fier-à-bras" or "Fièrebrace", in turn from the Latin "Ferox brachium"), was the Duke of Aquitaine and Count of Poitou from 963 to his retirement in 990.
William's father, William III, abdicated to the abbey of Saint-Cyprien in Poitiers and left the government to Fierebras.
His mother was Gerloc, the daughter of Duke Rollo of Normandy.
His sister was Adelaide, wife of Hugh Capet, the king against whom William later battled for his duchy.
His early reign was characterised by many wars.
He fought frequently against the counts of Anjou, the first time against Geoffrey Greymantle, who had taken Loudun.
In 988, he went to war with the newly elected king of France, Hugh Capet, whom he refused to recognise.
Capet had been granted Aquitaine by King Lothair before the latter had been reconciled to William's father.
Capet renewed his claim on the great duchy and invaded it that year.
A royal army was defeated on the plain of the Loire Valley.
William sheltered the young Louis, the son of Charles, Duke of Lower Lorraine, the last legitimate Carolingian heir.
He opened the palace of Poitiers to him and treated him as royalty, regarding him as the true heir to the French throne.
In 968, he married Emma or Emmeline, daughter of Theobald I of Blois and Luitgarde of Vermandois.
Their marriage was stormy, in part because of William's indulgence in the pursuit of women and, as a hunting aficionado, wild animals.
She banished his paramours, they separated twice for long periods, and finally he retired to a monastery, as his father had done, leaving Emma to rule Aquitaine in the name of their son William until 1004.
Their second son, Ebles, died sometime after 997.
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.
Louis X, Duke of Bavaria
Louis X( German: Ludwig X, Herzog von Bayern),( Grünwald, 18 September 1495 – 22 April 1545 in Landshut) was Duke of Bavaria( 1516 – 1545), together with his older brother William IV, Duke of Bavaria.
His parents were Albert IV and Kunigunde of Austria, a daughter of Emperor Frederick III.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
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:
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.

Question: Who is William Iv, Duke Of Aquitaine's maternal grandmother?
Answer: Poppa of Bayeux