Guillemette of Neufchâtel
Guillemette de Neufchâtel (1260–1317) was a French noblewoman, the daughter of Amadeus, Count of Neufchâtel and his wife, Jordanna of Arberg.
In 1259, her great-aunt Margaret, married Richard of Neufchâtel-en-Bourgogne.
As her dowry, she brought the Lordships of Blamont, Châtelot, Belmont, and Cuisance into the marriage.
The Lords of Neufchâtel-en-Bourgogne placed Blamont under the protection of the Duke of Burgundy and thus detached it from Montbéliard.
In 1282, Guillemette married Reginald of Burgundy.
They had five children:
In 1283, her great-grandfather, Theodoric III, Count of Montbéliard (1205–1283) died.
He had outlived all his children and in his will, he left the County of Montbéliard to his great-granddaughter Guillemette.
Theobald III of Neufchâtel, who was a grandchild of Theodoric III and who wanted Montbéliard for himself, conspired with Reginald's brother Otto IV to have Montbéliard recognized as a fief of Burgundy.
To resolve this, Reginald ceded Blamont and Châtelot to Theobald.
Andrew, Duke of Calabria
Andrew, Duke of Calabria( 30 October 1327 – 18 September 1345) was the first husband of Joanna I of Naples, and a son of Charles I of Hungary and brother of Louis I of Hungary.
Joanna of Burgundy
Joanna of Burgundy (died 1349) was a daughter of Reginald of Burgundy and his wife, Guillemette of Neufchâtel.
She married three times:
When her brother Othenin, Count of Montbéliard died childless in 1339, she and her second husband Rudolf Hesso inherited the Lordships of Belfort and Héricourt.
After the death of her third husband, she divided her possessions amongst her four daughters.
Margaret received Héricourt; Adelaide and Ursula shared Belfort.
Joan III, Countess of Burgundy
Joan III of Burgundy( 1/2 May 1308 – 10/15 August 1347), also known as Joan of France was a reigning Countess of Burgundy and Artois in 1330 – 1349, She was also Duchess of Burgundy by marriage to Odo IV, Duke of Burgundy.
She was the eldest daughter of King Philip V of France and Countess Joan II of Burgundy.
Florine of Burgundy
Florine of Burgundy( 1083–1097) was a French crusader.
She was the daughter of Eudes I, Duke of Burgundy and Sybilla of Burgundy.
Her maternal grandfather was William I, Count of Burgundy.
Florine was married to Sweyn the Crusader, a son of Sweyn II of Denmark.
Isabella of Bourbon
Isabella of Bourbon, Countess of Charolais( 1434 – 25 September 1465) was the second wife of Charles the Bold, Count of Charolais and future Duke of Burgundy.
She was a daughter of Charles I, Duke of Bourbon and Agnes of Burgundy, and the mother of Mary of Burgundy, heiress of Burgundy.
Reforce d'Agoult
Reforce d' Agoult was the Angevin seneschal of medieval Lombardy, under the reign of Joanna I of Naples.
Killed in battle at Gamenario, he was replaced by Roberto di Luinardo.
Otto, Duke of Brunswick-Grubenhagen
Otto, Duke of Brunswick- Grubenhagen( 1320 – 1 December 1398) was the fourth and last husband of Joanna I of Naples.
He also held the title of Prince of Taranto.
His nickname was Otto the Tarantine.
John of Valois, Count of Montpensier
John of Berry( 1375/1376–1397), count of Montpensier( 1386 – 1401), was a French nobleman.
He was the son of John, Duke of Berry, and of Joanna of Armagnac.
He had no children and predeceased his father.
He married twice:
Sibylla of Burgundy, Duchess of Burgundy
Sybilla of Burgundy( 1065 – 1103), was a French noble, Duchess consort of Burgundy by marriage to Eudes I, Duke of Burgundy.
She was a daughter of William I, Count of Burgundy and Stephanie.
She was married to Eudes I, Duke of Burgundy in 1080.
Children:

Question: Who is the maternal grandfather of Joanna Of Burgundy?
Answer: Amadeus, Count of Neufchâtel