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.
Margaret I, Countess of Flanders
Margaret I of Flanders (c. 1145 - died 15 November 1194) was ruling countess of Flanders "suo jure" from 1191 to her death.
She was the daughter of Thierry, Count of Flanders, and Sibylla of Anjou, and the heiress of her childless brother, Philip of Flanders.
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.
John I, Marquis of Namur
John I of Namur( 1267 – 31 January 1330) was the ruler of Namur from 1305 to 1330.
He was a member of the House of Dampierre, the son of Guy of Dampierre, Count of Flanders and Marquis of Namur, and his second wife Isabelle of Luxembourg.
John was the father of Blanche of Namur, Queen of Sweden and Norway.
He was the elder brother of Guy of Namur, whom he sent to command the Flemish rebels against the French Kingdom in the 1302 Battle of the Golden Spurs.
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.
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.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Philip I of Namur
Philip I (1175 – 9 October 1212), called the Noble, was the margrave of Namur from 1195 until his death.
He was the second son of Baldwin V, Count of Hainault, and Margaret I, Countess of Flanders.
His paternal grandmother was Alice, Countess of Namur.
Baldwin V had fought a war with his uncle, Henry IV of Luxembourg, to establish Namur as independent from Luxembourg in 1190 and in 1194, the Holy Roman Emperor Henry VI declared Namur to be a margraviate.
Baldwin's will left Namur to Philip, but as a fief of Hainault.
However, Theobald I of Bar, who had married Henry of Luxembourg's heiress, Ermesinda, refused to relinquish Namur and attacked Philip, besieging him in Namur.
The war lasted for three years until the Treaty of Dinant, signed on 26 July 1199, recognised Philip as holder of Namur.
Philip was left as regent of Hainault while his elder brother, Baldwin VI, went on the Fourth Crusade and acted as guardian to Baldwin's daughters, Joanna and Margaret.
Following Baldwin's capture at Adrianople, Philip was summoned to a meeting by Philip Augustus, King of France, at Pont de l'Arche.
Philip was forced to swear fealty to the King of France and give Baldwin's daughters as wards of the King.
Along with these exactions Philip was forced to marry Marie, daughter of Philip Augustus and Agnes of Merania.
In Namur, Philip reigned as a peaceful and pious promoter of social development.
He intervened as the mediator between many feuding lords.
He died of dysentery on 9 October 1212, in Valenciennes.
He had designated his twin sister Yolande as heir.

Question: Who is Philip I Of Namur's maternal grandmother?
Answer: Sibylla of Anjou