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.
Engilbert of Liederkerque
Engilbert of Liederkerque was a Flemish knight( from Liedekerke) who, along with his younger brother Walter, accompanied their uncle Florent of Hainaut to the Peloponnese( Morea) in southern Greece, following Florent's proclamation as Prince of Achaea in 1289.
There, Engilbert married a daughter of Richard Orsini, Count palatine of Cephalonia and Zakynthos.
In 1294, after the death of John Chauderon, who was his brother- in- law, Engilbert succeeded him as Grand Constable of Achaea.
Engilbert is mentioned only sporadically in the sources: in 1297, when he accompanied Princess Isabella of Villehardouin to Nesi near Kalamata; in 1301 among the Moreote barons who ratified the proclamation of Philip of Savoy as Prince; in early 1304 as one of the witnesses to the marriage of John I Orsini to Maria Komnene Doukaina, and in the act of donation of the fortresses of Karytaina and Araklovon to Isabella's daughter Matilda of Hainaut; and finally in an act of December 1305 signed at Thebes.
Baldwin V, Count of Hainaut
Baldwin V of Hainaut( 1150 – 17 December 1195) was count of Hainaut( 1171 – 1195), margrave of Namur as Baldwin I( 1189 – 1195) and count of Flanders as Baldwin VIII( 1191 – 1195).
Baldwin IV, Count of Hainaut
Baldwin IV( 1108 – 8 November 1171) was count of Hainaut from 1120 to his death.
He was the son of Baldwin III, Count of Hainaut, and Yolande de Wassenberg.
Matilda of Hainaut
Matilda of Hainaut( 29 November 1293 – 1331) was the Princess of Achaea from 1313 to 1318.
She was the daughter of Isabella of Villehardouin and her husband Florent of Hainaut.
In 1299, while still a child, she had been married to Guy II de la Roche, Duke of Athens.
Widowed in 1308, she was engaged to Charles of Taranto until 1313, when she remarried to Louis of Burgundy, who held the titular dignity of the long- extinct Kingdom of Thessalonica.
The marriage was intended to unite the Angevin and Burgundian houses.
So was the betrothal of the Empress Catherine II to Hugh V of Burgundy, Louis's elder brother.
However, Charles of Valois, Catherine's father, nixed the marriage and instead married her to Philip of Taranto.
It was in an effort to compensate the Burgundians that Philip renounced his claim to Achaea in favour of Matilda and gave her hand to Louis.
From 1307, when Philip of Savoy relinquished his claim, to 1312, when Isabella of Villehardouin died, Achaea was disputed between two claimants: Isabella and Philip I of Taranto.
In 1313, Philip granted it to Matilda, daughter of Isabella and her first husband Florent of Hainaut.
On Isabella's death, however, Ferdinand of Majorca laid claim to the principality in right of his wife, Isabella of Sabran, the daughter of Isabella's younger sister Margaret of Villehardouin.
The new couple quickly left for Greece to take possession of their fief, which was then occupied by their rival Ferdinand.
At the Battle of Manolada on 5 July 1316, Ferdinand was vanquished and killed and Louis took control of the Elis.
However, he was poisoned soon after, leaving a twice- widowed 23- year- old in charge of the Morea.
It was soon disputed by the varying claimants and Matilda was solidly dispossessed of her fief by 1318, in which year John, Duke of Durazzo, an Angevin, abducted the princess and forced her to marry him.
She did not give him children, however, and he repudiated her in 1321.
Matilda married yet again to Hugh de La Palice and retired to Aversa, where she died in 1331.
Helena Angelina Komnene
Helena Angelina Komnene  was a daughter of the Greek "sebastokrator" John I Doukas, ruler of Thessaly in ca. 1268–1289, and a Greek princess of Aromanian Greek origin, known only by her monastic name, Hypomone.
In 1275, the Byzantine Emperor Michael VIII Palaiologos sent a large army to subdue her recalcitrant father.
The Byzantine army besieged John's capital of Neopatras, but he managed to flee and seek the aid of the Duke of Athens, John I de la Roche (r. 1263–1280).
John I gave the necessary aid to the "sebastokrator", in exchange for the marriage of Helena to his brother, William I de la Roche, the future Duke of Athens (r. 1280–1287).
The Duchy also acquired the towns of Siderokastron, Zeitounion, Gravia, and Gardiki as her dowry.
The couple had a son, Guy II de la Roche (r. 1287–1308).
Following William's death, Helena served as regent for her underage son until his coming of age.
In 1289, she refused to recognize the suzerainty of the new Prince of Achaea, Florent of Hainaut, and the Angevin King of Naples, Charles II, as the common liege-lord of all Frankish states in Greece, had to force her to submit.
In 1291 she married Hugh of Brienne, Count of Lecce, who became the "bailli" of the Athenian duchy.
This allowed Helena once again to challenge Achaen suzerainty, and insist on her right to do homage directly to the King of Naples.
Charles II vacillated, but in the end Florent of Hainaut prevailed, and when Guy II of Athens came of age in 1296, he recognized Florent and his wife, Isabella of Villehardouin, as his liege-lords.
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.
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.
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.
Tommy Leclercq
Tommy Leclercq( born 1970) is a Belgian politician who has been governor of the province of Hainaut, Belgium, since March 2013.

Question: What nationality is Florent Of Hainaut's mother?
Answer: Germany