Question: Who is the paternal grandfather of Theobald Of Bar, Seigneur De Pierrepont?

Knowledge 1: Theobald of Bar, Seigneur de Pierrepont
Theobald of Bar( French: Thibauld/ Thiebaut de Bar), Seigneur of Pierrepont.He was one of six children born to Erard of Bar, Seigneur de Pierrepont et d'Ancerville( himself son of Theobald II of Bar), and Isabelle of Lorraine( daughter of Theobald II, Duke of Lorraine).In 1340, he married Marie de Namur( daughter of John I, of Dampierre and Marie of Artois), after her first husband Henry II, Graf of Vianden was murdered at Famagusta three years before.His wife, Marie gave birth to two daughters, Yolande and Elisabeth.When Theobald, died( between 2 August 1353 and 6 July 1354) he had no legitimate male heir, thus his daughter Elisabeth became the heiress of Bar- Pierrepont. [SEP] Knowledge 2: Henry II, Count of Bar
Henry II of Bar in French" Henri II de Bar", in German" Heinrich II von Bar"( 1190–13 November 1239) was a Count of Bar who reigned from 1214 to 1239.He was son of Count Theobald I of Bar and his first wife, Ermesinde of Bar-sur- Seine.Henry was killed on 13 November 1239 during the Barons' Crusade, when he diverted several hundred crusaders from the main army under Theobald I of Navarre to fight a force of Ayyubid Muslims at Gaza.
Knowledge 1: Theobald of Bar, Seigneur de Pierrepont
Theobald of Bar( French: Thibauld/ Thiebaut de Bar), Seigneur of Pierrepont.He was one of six children born to Erard of Bar, Seigneur de Pierrepont et d'Ancerville( himself son of Theobald II of Bar), and Isabelle of Lorraine( daughter of Theobald II, Duke of Lorraine).In 1340, he married Marie de Namur( daughter of John I, of Dampierre and Marie of Artois), after her first husband Henry II, Graf of Vianden was murdered at Famagusta three years before.His wife, Marie gave birth to two daughters, Yolande and Elisabeth.When Theobald, died( between 2 August 1353 and 6 July 1354) he had no legitimate male heir, thus his daughter Elisabeth became the heiress of Bar- Pierrepont. [SEP] Knowledge 2: Erard of Bar, Seigneur de Pierrepont et d'Ancerville
Erard of Bar,( French: Érard de Bar) was a monk by 1292 and then seigneur de Pierrepont et d'Ancerville by 1302.Erard was one of eight sons born to Theobald II, Count of Bar and his wife, Jeanne de Toucy.He married Isabella of Lorraine( d. 12 December 1353), daughter of Theobald II, Duke of Lorraine, and Isabelle de Rumigny; they had had six children.Erard died in 1335 at Pierrepont, France.
Knowledge 1: Theobald of Bar, Seigneur de Pierrepont
Theobald of Bar( French: Thibauld/ Thiebaut de Bar), Seigneur of Pierrepont.He was one of six children born to Erard of Bar, Seigneur de Pierrepont et d'Ancerville( himself son of Theobald II of Bar), and Isabelle of Lorraine( daughter of Theobald II, Duke of Lorraine).In 1340, he married Marie de Namur( daughter of John I, of Dampierre and Marie of Artois), after her first husband Henry II, Graf of Vianden was murdered at Famagusta three years before.His wife, Marie gave birth to two daughters, Yolande and Elisabeth.When Theobald, died( between 2 August 1353 and 6 July 1354) he had no legitimate male heir, thus his daughter Elisabeth became the heiress of Bar- Pierrepont. [SEP] Knowledge 2: Marie de Namur
Marie of Namur, also known as Marie de Namur or Maria van Dampierre.Her titles were" Gräfin von Vianden", from her first marriage and" Dame de Pierrepont", from her second marriage to, Theobald of Bar.Born in 1322 to John I of Namur and his wife Marie of Artois.She had three sisters, including Blanche of Namur, Queen consort of Sweden and Norway, and seven brothers.In 1335/ 36, she married her first husband, Henry II, Graf of Vianden, son of Philip II, Graf of Vianden and his first wife Lucia von der Neuerburg.Henry was murdered at Famagusta in September 1337.In c. 1337, she gave birth to Maria of Vianden her first daughter from her marriage to Henry II, Graf of Vianden.Her second marriage in 1340( dispensation 9 September 1342) was to her father's second cousin, Theobald of Bar, Seigneur de Pierrepont, son of Erard of Bar, Seigneur de Pierrepont et d'Ancerville( himself son of Theobald II of Bar), and his wife Isabelle of Lorraine( daughter of Theobald II, Duke of Lorraine).This marriage produced two daughters, Yolande de Bar( b. c 1343 – d. c 1410) and Elisabeth de Bar( b. c 1345 – d. before 11 May 1411).Marie died somewhere before 29 October 1353/ 57.

Answer: Theobald II, Count of Bar