Henry III, Count of Bar
Henry III of Bar (1259 – Naples, September 1302) was Count of Bar from 1291 to 1302.
He was the son of Theobald II, Count of Bar and Jeanne de Toucy.
Henry's introduction to military life came as he was made a knight in a conflict between his father and the Bishop of Metz.
He then served Frederick III, Duke of Lorraine.
He was preparing to go on crusade when his father died.
In 1284 Joan I of Navarre, Countess of Champagne married the future Philip IV of France.
Henry's reaction was a marriage to Eleanor, daughter of Edward
I of England.
When war broke out in short order between France and England, Henry was drawn in.
The fighting ceased after the 1301 Treaty of Bruges.
Under its terms, Henry gave up some fortresses and paid homage to Philip for part of his lands, then called the Barrois mouvant.
He also undertook to fight in Cyprus against the Muslim forces.
Henry therefore made his way to the Kingdom of Naples.
In assisting Charles II of Naples against the invading forces of Frederick II of Sicily, he was wounded in fighting, and died soon afterwards.
Edward II, Count of Bar
Edward II of Bar( 1339 – May 1352) was Henry IV of Bar's eldest son and successor as count of Bar( with Edward's mother Yolande of Flanders ruling as count during his minority, which ended on 10 October 1349).
He had no male issue and was succeeded as count by his younger brother Robert I of Bar.
Henry IV, Count of Bar
Henry IV of Bar( abt 1315 – 1344) was count of Bar from 1336 to 1344.
His aunt, Joan of Bar, Countess of Surrey, governed Bar in his name during his minority.
He was the son of Edward I of Bar and his wife Marie of Burgundy.
He married Yolande of Dampierre( died 1395), a granddaughter of Robert III, Count of Flanders.
Henry and Yolande had two sons:
Jean Pasquerel
Jean Pasquerel( c. 1400) was an Augustinian friar( member of the Order of St. Augustine), almoner and confessor of Joan of Arc.
Robert, Duke of Bar
Robert I of Bar (8 November 1344 – 12 April 1411) was Marquis of Pont-à-Mousson and Count and then Duke of Bar.
He succeeded his elder brother Edward II of Bar as count in 1352.
His parents were Henry IV of Bar and Yolande of Flanders.
When Robert was less than a year old, his father died and his elder brother, Edward II of Bar, became Count of Bar under their mother's regency.
As neither Robert nor Edward had a strong constitution, Yolande obtained a papal dispensation from Clement VI to allow them to eat meat during periods of abstinence.
When his brother Edward died, Robert was still only seven years old and political problems associated with his mother's continued position as regent had arisen.
Yolande was on the point of remarrying to Philip of Navarre, count of Longueville, a member of the Navarre family which was attempting to claim the French crown from John the Good.
Joan of Bar, Robert's grandaunt, made known to the king that she was ready to replace Yolande and assume the regency.
The Parliament of Paris, by decree of 5 June 1352, declared that the county was under the king's control.
John the Good then entrusted the regency to Joan on 27 July of that year.
Yolande initially renounced the regency, but then went back on her decision, levying troops to fight Joan.
John the Good intervened to force Yolande to renounce the regency again on 2 July 1353.
In 1354 the County of Bar was raised to the status of duchy by King John the Good.
That same year another possession, Pont-à-Mousson, was raised to a marquisate by Emperor Charles IV.
Subsequent emperors recognised Robert's ducal title and his state's right to a vote in the Imperial Diet.
It is unclear if Robert was regarded as a Peer of France after becoming duke.
The defeat of Poitiers and the capture of John the Good in 1356 deprived Joan of John's support and Yolande retook the regency.
Robert was knighted in December 1356 and declared of age on 8 November 1359.
He assisted at the coronation of Charles V of France at Reims on 9 May 1364, then at that of Charles VI of France on 4 November 1380.
During Charles V's reign he fought in several engagements in 1374 during the campaign to eject the English from Normandy.
In 1401, Robert ceded his duchy to his son Edward, but reserved the usufruct on it, bypassing his grandson Robert (son of Henry of Bar).
The younger Robert unsuccessfully opposed this in the parliament of Paris that ran from 1406 to 1409.
Charles VI's madness put him under the control of the Duke of Orleans and Duke of Burgundy.
The elder Robert supported the duke of Orleans, and after that duke's assassination was more and more inclined to remain within his duchy.
In his later years he suffered from attacks of gout that prevented him from walking.
Margaret of Bar
Margaret of Bar( 1220–1275) was a daughter of Henry II of Bar and his wife Philippa of Dreux.
She was Countess of Luxembourg by her marriage to Henry V of Luxembourg.
She is also known as" Marguerite of Bar".
Joan of Bar, Countess of Surrey
Joan of Bar (died 1361) was a French-English noble.
She acted as regent of the County of Bar from 1344 until 1353.
She was a daughter of Henry III, Count of Bar and Eleanor of England, and niece of Edward II of England.
She was unhappily married to John de Warenne, 7th Earl of Surrey.
In 1345, Joan became the regent of Bar for her great-nephew Robert.
Jean de Metz
Jean de Metz( also Jean de Nouillonpont)( born c. 1398) was a French nobleman who is known primarily for his role in the exploits of Joan of Arc.
Robert le Maçon
Robert le Maçon( c. 1365 – 28 January 1443) was chancellor of France, advisor to Charles VII and supporter of Joan of Arc.
Yolande of Aragon
Yolande of Aragon( 11 August 1384 – 14 November 1442) was a throne claimant and titular queen regnant of Aragon, titular queen consort of Naples, Duchess of Anjou, Countess of Provence, and regent of Provence during the minority of her son.
She was a daughter of John I of Aragon and his wife Yolande of Bar( daughter of Robert I, Duke of Bar, and Marie of Valois).
Yolande played a crucial role in the struggles between France and England, influencing events such as the financing of Joan of Arc's army in 1429 that helped tip the balance in favour of the French.
She was also known as Yolanda de Aragón and Violant d' Aragó.
Tradition holds that she commissioned the famous Rohan Hours.

Question: Who is the paternal grandfather of Joan Of Bar, Countess Of Surrey?
Answer: Theobald II, Count of Bar