Joanna, Duchess of Durazzo
Joanna of Durazzo( 1344 – 20 July 1387) was the eldest daughter and eldest surviving child of Charles, Duke of Durazzo, and his wife, Maria of Calabria.
She succeeded as duchess on the death of her father in 1348 when she was only a child of four years old.
Joanna was a member of the House of Anjou- Durazzo.
She reigned as Duchess of Durazzo from 1348- 1368.
She married twice; firstly to Louis of Navarre and then to Robert IV of Artois, Count of Eu.
Marie of Savoy, Countess of Saint-Pol
Marie of Savoy, Countess of Saint- Pol, de Brienne, de Ligny, and Conversano( 20 March 1448 – 1475) was the second wife of Louis de Luxembourg, Count of Saint- Pol, Constable of France.
She was a younger daughter of Louis, Duke of Savoy and Anne de Lusignan, Princess of Cyprus, one of nineteen children.
Louis, Duke of Durazzo
Louis of Évreux (also called "of Navarre"; 1341 – 1376) was the youngest son of Philip III of Navarre and Joan II of Navarre.
He inherited the county of Beaumont-le-Roger from his father (1343) and became Duke of Durazzo in right of his second wife, Joanna, in 1366.
Louis's first marriage was to Maria de Lizarazu in 1358.
He took part on behalf of his brother Charles II of Navarre in the war against the Dauphin Charles.
His second marriage to Joanna, Duchess of Durazzo, brought him the rights to Durazzo and the Kingdom of Albania, which he strove to recover.
He received assistance from both his brother and the king of France in this undertaking, for Durazzo (the remnant of the kingdom) was in the hands of Charles Thopia.
In 1372, he brought over the Navarrese Company of mercenaries, who had fought with him during the war in France, to assist him in taking Durazzo.
Their ranks swelled considerably in 1375 with new recruits directly from Navarre.
Many documents survive telling us of the complex nature of the military planning and engineering which was undertaken to ensure success.
This they attained, taking the city in midsummer 1376.
Louis died shortly after.
Charles, Duke of Durazzo
Charles of Durazzo( 1323 – 23 January 1348) was a Neapolitan nobleman, the eldest son of John, Duke of Durazzo and Agnes of Périgord.
Louis, Count of Gravina
Louis of Durazzo (1324 – 22 July 1362) was Count of Gravina and Morrone.
He was the son of John of Gravina and Agnes of Périgord.
In 1337, he was named Vicar- and Captain-General of the Kingdom of Albania.
During the ascension of the Durazzeschi at the court of Naples during the reign of Joanna I, he was one of the royal ambassadors to the Roman Curia.
Upon the invasion of Louis I of Hungary and the execution of his elder brother, Charles, Duke of Durazzo, in 1348, he was imprisoned, with his younger brother Robert of Durazzo, until 1352.
The rest of his life was spent stirring up revolts against Joanna in Apulia with the aid of some Free Companions.
These were ultimately quashed in 1360 by Louis of Taranto, and Louis of Durazzo was imprisoned in the Castel dell'Ovo in Naples and murdered by poison.
Joan II of Navarre
Joan II (28 January 1312 – 6 October 1349) was Queen of Navarre from 1328 until her death.
She was the only surviving child of Louis X of France, King of France and Navarre, and Margaret of Burgundy.
Joan's paternity was dubious because her mother was involved in a scandal, but Louis X declared her his legitimate daughter before he died in 1316.
However, the French lords were opposed to the idea of a female monarch and elected Louis X's brother, Philip V, king.
The Navarrese noblemen also paid homage to Philip.
Joan's maternal grandmother, Agnes of France, Duchess of Burgundy, and uncle, Odo IV of Burgundy, made attempts to secure the counties of Champagne and Brie (which had been the patrimony of Louis X's mother, Joan I of Navarre) to Joan, but the French royal troops defeated her supporters.
After Philip V married his daughter to Odo and granted him two counties as her dowry, Odo renounced Joan's claim to Champagne and Brie in exchange for a compensation in March 1318.
Joan married Philip of Évreux, who was also a member of the French royal family.
Philip V was succeeded by his brother, Charles IV, in both France and Navarre in 1322, but most Navarrese lords refused to swear loyalty to him.
After Charles IV died in 1328, the Navarrese expelled the French governor and declared Joan the rightful monarch of Navarre.
In France, Philip of Valois was crowned king.
He concluded an agreement with Joan and her husband, who renounced Joan's claims to Champagne and Brie in exchange for three counties, while Philip acknowledged their right to Navarre.
Joan and her husband were together crowned in Pamplona Cathedral on 5 March 1329.
The royal couple closely cooperated during their joint reign, but Philip of Évreux was more active.
However, they mostly lived in their French domains.
Navarre was then administered by governors during their absence.
Louis Joseph, Duke of Guise
Louis Joseph de Lorraine" Duke of Guise" and Duke of Angoulême,( 7 August 1650 – 30 July 1671) was the only son of Louis, Duke of Joyeuse and Marie Françoise de Valois, the only daughter of Louis- Emmanuel d' Angoulême, Count of Alès, Governor of Provence and son of Charles de Valois Duke of Angoulême, a bastard of Charles IX of France.
Beatrice of Bourbon, Queen of Bohemia
Beatrice of Bourbon( 1320 – 23 December 1383) was a French noblewoman.
A member of the House of Bourbon, she was by marriage Queen of Bohemia and Countess of Luxembourg.
She was the youngest daughter of Louis I, Duke of Bourbon, and Mary of Avesnes.
Christian Louis I, Duke of Mecklenburg
Christian Louis I, Duke of Mecklenburg- Schwerin( 1 December 1623 in Schwerin – 21 June 1692 in The Hague) was a reigning Duke of Mecklenburg- Schwerin.
Richard Wesley, 1st Baron Mornington
Richard Colley Wesley, 1st Baron Mornington (– 31 January 1758) was an Irish peer, best remembered as the grandfather of Arthur Wellesley, 1st Duke of Wellington.

Question: Who is the maternal grandfather of Louis, Duke Of Durazzo?
Answer: Louis X of France