Question: Who is the paternal grandfather of Joan Of Bar, Countess Of Surrey?

Knowledge 1: 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. [SEP] Knowledge 2: 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 EdwardI 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.
Knowledge 1: 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. [SEP] Knowledge 2: 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.
Knowledge 1: 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 EdwardI 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. [SEP] Knowledge 2: 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.

Answer: Theobald II, Count of Bar