Ermengarde, Viscountess of Narbonne
Ermengarde( Occitan: Ermengarda, Ainermada, or Ainemarda)( b. 1127 or 1129 – d. Perpignan, 14 October 1197), was a viscountess of Narbonne from 1134 to 1192.
She was the daughter of Aimery II of Narbonne and his first wife, also named Ermengarde.
Charles, Duke of Orléans
Charles of Orléans (24 November 1394 – 5 January 1465) was Duke of Orléans from 1407, following the murder of his father, Louis I, Duke of Orléans, on the orders of John the Fearless, Duke of Burgundy.
He was also Duke of Valois, Count of Beaumont-sur-Oise and of Blois, Lord of Coucy, and the inheritor of Asti in Italy via his mother Valentina Visconti, daughter of Gian Galeazzo Visconti, Duke of Milan.
He is now remembered as an accomplished medieval poet owing to the more than five hundred extant poems he produced, written in both French and English, during his 25 years spent as a prisoner of war and after his return to France.
Merwan ha-Levi
Merwan ha- Levi was one of the most prominent Jews of Narbonne in the second half of the 11th century.
He was a philanthropist, who devoted his time and fortune to that community.
It seems that he was also in favor with the government, being thus enabled to check unfavorable measures against the Jews.
He was the head of a family which produced several famous Jewish scholars, among whom were his son, Rabbi Isaac of Narbonne, and his grandson, Nasi Moses ben Joseph of Narbonne.
Princess Marie of Hanover
Princess Marie of Hanover (2 December 1849 – 4 June 1904) was the younger daughter of King George V of Hanover and of his wife, Princess Marie of Saxe-Altenburg.
Philip, Count of Vertus
Philip of Orléans, Count of Vertus( 21/24 July 1396 – 1 September 1420), was the second son of Louis I, Duke of Orléans, and Valentina Visconti, and a grandson of Charles V of France.
His older brother was the noted poet Charles, Duke of Orléans and his younger brother was John, Count of Angoulême.
Gilbert of Narbonne
Gilbert of Narbonne was a Goth count of Narbonne who governed until about 750.
His successor was Miló.
Mafalda of Pulla-Calabria
Mafalda of Pulla- Calabria( 1060- Gerona 1108), also known like Mahalta, Mata or Mathilda, was countess consort of Barcelona and Viscountess Consort of Narbonne.
Daughter of Robert Guiscard, Duke of Calabria, and his second wife Sikelgaite of Salerno, and sister of Roger Borsa, heir of the duchy of Calabria.
In 1078 she married the Count of Barcelona Ramon Berenguer II, with whom she had the following children:
She was widowed in 1082 and married the following year with Aymerich I of Narbonne, Viscount of Narbonne.
From this marriage was born the future Aymerich II, heir of the viscounty of Narbonne, and Berengar, archbishop of Narbonne.
Marie of Orléans, Viscountess of Narbonne
Marie of Orléans (19 December/September 1457 – 1493) was the elder sister of King Louis XII of France.
Due to her marriage to John of Foix, she was Countess of Étampes and Viscountess of Narbonne.
Marie was the eldest daughter of Charles, Duke of Orléans, and his third wife Marie of Cleves.
After a previous betrothal to Peter II, Duke of Bourbon, she married John of Foix on 8 September 1476.
Princess Henriette of Belgium
Princess Henriette of Belgium, later Princess Henriette of Orléans, Duchess of Vendôme( 30 November 1870 – 28 March 1948), was the daughter of Prince Philippe, Count of Flanders, and Princess Marie of Hohenzollern- Sigmaringen.
She was the younger twin sister of Princess Joséphine Marie of Belgium, who died at the age of six weeks in 1871.
Aimery I of Narbonne
Aimery I of Narbonne, son of Bernard Berenger of Narbonne and Foy of Rouergue.
He was viscount of Narbonne 1071 until his death in the Holy Land in 1106.

Question: Who is Marie Of Orléans, Viscountess Of Narbonne's paternal grandfather?
Answer: Louis I, Duke of Orléans