Stephen, Count of Blois
Stephen II Henry (in French, "Étienne Henri", in Medieval French, "Estienne Henri"; – 19 May 1102), Count of Blois and Count of Chartres, was the son of Theobald III, count of Blois, and Gersent of Le Mans.
He is numbered Stephen II after Stephen I, Count of Troyes.
In 1089, upon the death of his father, he became the Count of Blois and Chartres, although Theobald had given him the administration of those holdings in 1074.
He was the father of Stephen of England.
Count Stephen was one of the leaders of the First Crusade, leading one of the major armies of the Princes and often writing enthusiastic letters to his wife Adela of Normandy about the crusade's progress.
Stephen was the head of the army council at the Crusaders' siege of Nicaea in 1097.
He returned home in 1098 during the lengthy siege of Antioch, fleeing the battlefield, without having fulfilled his crusading vow to forge a way to Jerusalem.
He was pressured by Adela into making a second pilgrimage, and joined the minor crusade of 1101 in the company of others who had also returned home prematurely.
In 1102, Stephen was killed at the Second Battle of Ramla at the age of fifty-seven.
Beatrice of Navarre, Duchess of Burgundy
Beatrice of Navarre( 1242? – 1295), was Duchess of Burgundy, by marriage to Hugh IV, Duke of Burgundy.
She was a daughter of Theobald I of Navarre and his third wife Margaret of Bourbon.
Her siblings included Theobald II of Navarre and Henry I of Navarre.
She is also known as Beatrix of Champagne.
Matilda of Carinthia
Matilda of Carinthia or Mathilde of Sponheim( died 13 December 1160 or 1161) was the daughter of Engelbert, Duke of Carinthia and his wife Uta of Passau.
She married Theobald II, Count of Champagne in 1123.
She was the mother of Adèle of Champagne, Queen of France and thus the maternal grandmother of Philip II of France.
Her ten children with Theobald were:
Blanche of Navarre, Duchess of Brittany
Blanche of Navarre( 1226 – 12 August 1283), also known as Blanche of Champagne, was the daughter of Theobald the Troubador, King of Navarre and Count of Champagne, and his second wife Agnes of Beaujeu.
She was a member of the House of Champagne.
By her marriage to John I, Duke of Brittany, she became Duchess consort of Brittany.
Theobald II, Count of Champagne
Theobald the Great (French: Thibaut de Blois) (1090–1152) was Count of Blois and of Chartres as Theobald IV from 1102 and was Count of Champagne and of Brie as Theobald II from 1125.
He held Auxerre, Maligny, Ervy, Troyes, and Châteauvillain as fiefs from Odo II, Duke of Burgundy.
He was the son of Stephen II, Count of Blois, and Adela of Normandy, and the elder brother of King Stephen of England.
Although he was the second son, Theobald was appointed above his older brother William.
Several historians have painted William as mentally deficient, but this has never been substantiated.
However, we know that his mother found him stubbornly resistant to control and unfit for wide-ranging comital duties.
Theobald had no such problems.
Theobald accompanied his mother throughout their realm on hundreds of occasions and, after her retirement to Marcigney in 1125, he administered the family properties with great skill.
Adela died in her beloved convent in 1136, the year after her son Stephen was crowned king of England.
King Louis VII of France became involved in a war with Theobald by permitting Count Raoul I of Vermandois and seneschal of France, to repudiate his wife Eleanor, Theobald's sister, and to marry Petronilla of Aquitaine, sister of the queen of France.
The war, which lasted two years (1142–1144), was marked by the occupation of Champagne by the royal army and the capture of Vitry-le-François, where many persons perished in the deliberate burning of the church by Louis.
The scholastic Pierre Abélard, famous for his love affair with and subsequent marriage to his student Héloïse, sought asylum in Champagne during Theobald II's reign.
Abelard died at Cluny Abbey in Burgundy, a monastery supported by the Thebaudians for many centuries.
In 1123 he married Matilda of Carinthia, daughter of Engelbert, Duke of Carinthia.
Their children were:
Thibaut had an illegitimate son,
Theobald II of Navarre
Theobald II (6/7 December 1239 – 4/5 December 1270) was King of Navarre and also, as Theobald V, Count of Champagne and Brie, from 1253 until his death.
He was the son and successor of Theobald I and the second Navarrese monarch of the House of Blois.
After he died childless, the throne of Navarre passed to his younger brother, Henry I.
Margaret of Bourbon, Queen of Navarre
Margaret of Bourbon( 1217 – 12 April 1256) was Queen of Navarre and Countess of Champagne from 1232 until 1253 as the third wife of Theobald I of Navarre.
After her husband's death, she ruled both the kingdom and the county as regent for three years in the name of their son, Theobald II of Navarre.
Scholastique of Champagne
Scholastique of Champagne( 1172–1219) was the daughter of Marie, Countess of Champagne and Henry I, Count of Champagne.
Adela of Champagne
Adela of Champagne( c. 1140 – 4 June 1206), also known as Adelaide, Alix and Adela of Blois, was Queen of France as the third wife of Louis VII.
She was the third child and first daughter of Theobald II, Count of Champagne, and Matilda of Carinthia children and had nine brothers and sisters.
She was named after her grandmother, Adela of Normandy.
She was regent of France in the absence of her son in 1190.
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.

Question: Who is Theobald Ii, Count Of Champagne's paternal grandfather?
Answer: Theobald III