Henry II, Duke of Guise
Henry II de Lorraine, 5th Duke of Guise( 4 April 1614, in Paris – 2 June 1664, in Paris) was the second son of Charles, Duke of Guise and Henriette Catherine de Joyeuse.
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.
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.
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.
Robert, King of Naples
Robert of Anjou , known as Robert the Wise (1276 – 20 January 1343), was King of Naples, titular King of Jerusalem and Count of Provence and Forcalquier from 1309 to 1343, the central figure of Italian politics of his time.
He was the third son of King Charles II of Naples and Maria of Hungary, and during his father's lifetime he was styled Duke of Calabria (1296–1309).
Sofía Landaluce y Melgarejo
Princess Sofía of Bourbon- Two Sicilies, Duchess of Calabria( née Landaluce y Melgarejo; 23 November 1973) is the wife and consort of Prince Pedro, Duke of Calabria, who is one of two claimants to the head of the House of Bourbon- Two Sicilies.
Louis, Duke of Joyeuse
Louis de Lorraine, Duke of Joyeuse( 11 January 1622 – 27 September 1654, Paris) was a younger son of Charles, Duke of Guise and Henriette Catherine de Joyeuse.
Charles, Duke of Calabria
Charles, Duke of Calabria (1298 – 9 November 1328) was the son of King Robert of Naples and Yolanda of Aragon.
Charles was born in Naples in 1298, during the reign of his paternal grandfather King Charles II, the second king of the angevin dynasty that ruled Naples since 1266.
Charles was the son of the King's third son Prince Robert and his consort Yolanda of Aragon.
Little is known of his early life, so one can assume that he spent his early years at the court of his grandfather.
In 1309, Charles' grandfather died and his father became King Robert the Wise.
It was then that he became Duke of Calabria and was created Vicar-General of the Kingdom of Sicily (Naples).
His father intended him to lead the force sent to aid Florence in 1315, but was constrained by time to send Robert's brother, Philip I of Taranto, instead.
The Florentine-Neapolitan coalition was badly beaten at the ensuing Battle of Montecatini.
The victory of Castruccio Castracani at Altopascio in 1325 led the Florentines to elect Charles "signore" (lord) of the city for ten years in 1326.
At the time, he was unsuccessfully attempting to seize Sicily from his first cousin Frederick III, and sent Walter VI of Brienne as his deputy until he could arrive, where Walter made a (misleadingly) favorable impression.
While Charles' arrival checked Castruccio, he exacted onerous taxes from the Florentines, until he was recalled to Naples in December 1327 due to the advance of Emperor Louis IV into Italy.
There he died in 1328.
He left as heir his eldest surviving daughter, Joanna Ι;
a posthumous daughter, Marie, was born in 1329.
Charles was buried in the church of Santa Chiara in Naples.
Prince Pedro, Duke of Calabria
Prince Pedro of Bourbon- Two Sicilies, Duke of Calabria
( Spanish:" Pedro Juan María Alejo Saturnino y Todos los Santos"; born 16 October 1968), is the only son of Infante Carlos, Duke of Calabria( 1938 – 2015) and his wife, Princess Anne of Orléans.
Peter II, Duke of Bourbon
Peter II, Duke of Bourbon (1 December 1438 – 10 October 1503 in Moulins), was the son of Charles I, Duke of Bourbon, and Agnes of Burgundy, and a member of the House of Bourbon.
He and his wife Anne of France ruled as regents during the minority of Charles VIII of France.

Question: Who is the paternal grandfather of Charles, Duke Of Calabria?
Answer: Charles II of Naples