Agnes of France, Duchess of Burgundy
Agnes of France( c. 1260 – 19 December 1327) was a Duchess of Burgundy by marriage to Robert II, Duke of Burgundy.
She served as regent of Burgundy during the minority of her son in 1306 – 1311.
Elisabeth of Cleves, Countess of Schwarzburg-Blankenburg
Elisabeth of Cleves was the daughter of Adolph I, Duke of Cleves and Marie of Burgundy, Duchess of Cleves.
She married Count Henry XXVI of Schwarzburg- Blankenburg, on July 15, 1434.
Ermentrude de Roucy
Ermentrude de Roucy (born 958 - died 5 May 1005)
(Irmtrude) was a Countess and Duchess of Burgundy.
She was a daughter of Renaud of Roucy and his wife, Alberade of Lorraine, daughter of Gilbert, Duke of Lorraine.
Ermentrude married Alberic II of Mâcon and thus became a countess of Mâcon.
She also married Otto-William, Count of Burgundy.
They had children:
Agnes of Waiblingen
Agnes of Waiblingen( 1072/ 73 – 24 September 1143), also known as Agnes of Germany, Agnes of Poitou and Agnes of Saarbrücken, was a member of the Salian imperial family.
Through her first marriage, she was Duchess of Swabia; through her second marriage, she was Margravine of Austria.
Agnes of Aquitaine, Queen of Aragon and Navarre
Agnes of Aquitaine( end of 1072 – 6 June 1097) was a daughter of William VIII, Duke of Aquitaine, and his third wife, Hildegarde of Burgundy, and thus half- sister of Agnes of Aquitaine, Queen of Castile, with whom she is sometimes confused.
In 1081, Agnes was betrothed to Peter I of Aragon and Navarre.
During 1086 in Jaca the couple married, and upon Peter's succession, Agnes became queen of Aragon and Navarre.
By him, Agnes had two children, both of whom predeceased their father: Peter( died 1103) and Isabella( died 1104).
Agnes died in 1097, and her husband remarried to a woman named Bertha.
Anne of Burgundy
Anne of Burgundy, Duchess of Bedford( 30 September 1404 – 13 November 1432) was a daughter of John the Fearless, Duke of Burgundy( 1371 – 1419) and his wife Margaret of Bavaria( 1363 – 1423).
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.
Agnes of Burgundy, Duchess of Aquitaine
Agnes of Burgundy (or Agnes de Macon; died 10 November 1068) was Duchess of Aquitaine by marriage to Duke William V and Countess of Anjou by marriage to Count Geoffrey II.
She served as regent of the Duchy of Aquitaine during the minority of her son from 1039 until 1044.
She was a daughter of Otto-William, Count of Burgundy and Ermentrude de Roucy and a member of the House of Ivrea.
Henry, son of Robert I of Burgundy
Henry of Burgundy (c. 1035 – January 27, 1070/1074), called the Gallant ("le Damoiseau"), was the eldest surviving son and heir of Robert I, Duke of Burgundy, second son of Robert II of France, and his wife, Helie of Semur, granddaughter of Henry I, Duke of Burgundy.
Little is known about his life.
He died shortly before his father and was never duke himself.
The name of Henry's wife is not known, though both Sibylla and Clémence have been suggested.
The first of these derives from an undated obituary from Besançon, Sainte-Etienne, naming "Sibilla, mater ducus Burgundie" (Sibylla, mother of the Duke of Burgundy), it being reasoned that since she is not called duchess, she must have been married to the sole father of a duke who was not a duke himself, Henry.
However, it has been argued by Jean Richard that this is a reference to Sibylla of Burgundy, Duchess of Burgundy, mother of the then-ruling duke, Hugh II.
Richard proposed based on the name's repeated use among the descendants of her son Odo I, Duke of Burgundy that she may have been named Clémence, although Odo's wife had a sister, Clementia of Burgundy, who could have been the inspiration for its use among their descendants.
Based on the use of the byname "Borel" by Odo I, genealogist Szabolcs de Vajay proposed that his mother was the daughter of Berenguer Ramon I, Count of Barcelona and his third wife, Guisle of Lluca, and hence granddaughter of Ramon Borrell, Count of Barcelona, although there is no documentary evidence that this was the case.
Henry's wife died on or after July 6, 1074.
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.

Question: Who is the maternal grandfather of Agnes Of Burgundy, Duchess Of Aquitaine?
Answer: Renaud of Roucy