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.
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.
Mary of Avesnes
Marie of Hainaut( 1280–1354) was the daughter of John II, Count of Holland and Philippa of Luxembourg, her brother was William I, Count of Hainaut.
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
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.
Baldwin III, Count of Hainaut
Baldwin III( 1088–1120) was count of Hainaut from 1098 to his death.
He was son of Baldwin II, Count of Hainaut, and Ida of Louvain.
Laure Manaudou
Laure Manaudou( born 9 October 1986) is a retired French Olympic, world and European champion swimmer.
She has held the world record in freestyle events between 200 and 1500 meter.
She is the daughter of a French father and a Dutch mother, and she is the older sister of Florent Manaudou who is also an Olympic gold medalist swimmer.
Abd al-Muttalib
Abd al- Muttalib Shaybah ibn Hashim( c. 497 – 578) was the grandfather of Islamic prophet Muhammad.
Lyon Cohen
Lyon Cohen( 1868–1937) was a Polish- born Canadian businessman and a philanthropist.
He was the grandfather of singer/ poet Leonard Cohen.
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.

Question: Who is Florent Of Hainaut's maternal grandfather?
Answer: Floris IV, Count of Holland