Adelaide of Holland
Adelaide of Holland (– buried 9 April 1284), Countess of Hainaut, was a Dutch regent.
She was a daughter of Floris IV, Count of Holland and Matilda of Brabant.
She was also a sister of William II, Count of Holland and King of Germany.
She acted as regent for her nephew Count Floris V during his minority.
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.
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.
Hüma Hatun
Hüma Hatun (1410 ‒ September 1449) was the fourth wife of Ottoman Sultan Murad II and mother of Mehmed II and the grandmother of Bayezid II.
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.
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.
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.
Florent of Hainaut
Florent of Hainaut (also "Floris" or "Florence"; Hainaut, also spelled "Hainault")
(c. 1255 – 23 January 1297) was Prince of Achaea from 1289 to his death, in right of his wife, Isabella of Villehardouin.
He was the son of John I of Avesnes and Adelaide of Holland.
From his father he received the stadholdership (government) of Zeeland.
After he left Zeeland, he took up service with Charles II of Naples, who made him constable of the Kingdom of Naples.
After his marriage with Isabella (16 September 1289), he had one daughter: Matilda.
She would succeed him and her mother as princess.
Florent settled with his wife in Morea.
He negotiated the Treaty of Glarentsa with the Byzantine Empire in 1290.
The situation for the Franks in Greece was hopeless by this time, however.
The fall of the Angevins in Sicily meant that they were preoccupied with recouping territory there and few Western governments would send troops to defend Morea.
Florent thus made peace and maintained it until 1293, when the Greeks retook Kalamata.
Florent did not despair and did not reopen the war which had been ongoing until his succession: he instead sent an embassy in protest to Andronikos II Palaiologos, and the emperor returned Kalamata.
In 1296, the Greeks retook the castle of Saint George in Arcadia.
Florent besieged the castle, but died before it could be taken.
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.

Question: Who is the maternal grandmother of Florent Of Hainaut?
Answer: Matilda of Brabant