Ermengarde of Tonnerre
Ermengarde( 1032 – 1083), daughter of Renauld, Count of Tonnerre and Herviz, she married William I, Count of Nevers in 1045.
She had six children:
Her husband William I was the son of Renauld I, Count of Nevers and Hedwig/ Advisa of Auxerre, daughter of Robert II of France.
Humbert II, Count of Savoy
Umberto II, nicknamed the Fat( 1065, Carignano, Piedmont – 19 October 1103), was Count of Savoy from 1080 until his death in 1103.
He was the son of Amadeus II of Savoy.
He was married to Gisela of Burgundy, daughter of William I, Count of Burgundy, and had 7 children:
John, Count of Eu
John, Count of Eu,( died 26 June 1170), son of Henry I, Count of Eu, and Marguerite, daughter of William, Count of Sully, who was brother of Stephen, King of England.
John was Count of Eu and Lord of Hastings.
John obtained from Étienne d' Angleterre( later Stephen, King of England) the honors of Tickhill and Blyth, being a descendant of their original owner, Roger de Busli, by his paternal grandmother Beatrice.
John lost his holdings after his capture by Ranulf de Gernon, the 4th Earl of Chester, at the Battle of Lincoln in February 1141.
In 1148, John returned to Hilaire, Bishop of Chichester, lands belonging to his diocese which his father had usurped during the troubled reign of Stephen.
John had to take refuge in the summer of 1167 in Drincourt( now Neufchâ tel- en- Bray) during the invasion of his estates by the troops of Louis VII, an ally of Thierry, Count of Flanders.
John married Alice, daughter of William d' Aubigny, 1st Earl of Arundel, and Adeliza of Louvain, the widow of King Henry I of England.
John and Alice had three children:
In addition, Like his father Henry, John became canon at the abbey of Eu, where he died on June 26, 1170, after devoting the rest of his days to the monastic state.
He was placed in the tomb of his father behind the altar.
At the time of the destruction of the Abbey of Foucarmont in 1791, Louis Jean Marie de Bourbon, Duke of Penthièvre and Count of Eu, had the remains of the counts Henry and John reclaimed and moved to the chapel of the.
John was succeeded as Count of Eu and Lord of Hastings by his son Henry upon his death.
John was buried at Fécamp Abbey, where many of his sons and grandsons would also be interred.
William I, Duke of Bavaria
William I, Duke of Bavaria- Straubing( Frankfurt am Main, 12 May 1330 – 15 April 1389, Le Quesnoy), was the second son of Emperor Louis IV and Margaret II of Hainaut.
He was also known as William V, Count of Holland, as William III, Count of Hainaut and as William IV, Count of Zeeland.
William I, Count of Nevers
William I, Count of Nevers, was the son of Renauld I, Count of Nevers and Hedwig of France, Countess d' Auxerre.
In 1040 he succeeded his father as Count of Nevers and d'Auxerre and in 1065 he was also the Count of Tonnerre.
He married Ermengarde, daughter of Renauld, Count of Tonnerre about 1039.
William died at Nevers 20 June 1100.
William I and Ermengarde had six children:
Mary of Avesnes
Marie of Hainaut( 1280–1354) was the daughter of John II, Count of Holland and Philippa of Luxembourg, her brother was William I, Count of Hainaut.
Johann William, Count of Erbach-Fürstenau
Johann William, Count of Erbach- Fürstenau( 13 February 1707 – 1 August 1742), was a member of the German House of Erbach who held the fiefs of Fürstenau, Michelstadt and Breuberg.
Born in Hanau, he was the fourth child and only son of Philipp Charles, Count of Erbach- Fürstenau and his first wife Caroline Amalie, a daughter of Johann Dietrich, Count of Kunowitz.
William, Count of Sully
William the Simple (– c. 1150) was Count of Blois and Count of Chartres from 1102 to 1107, and jure uxoris Count of Sully.
William was the eldest son of Stephen-Henry, Count of Blois and Adela of Normandy, daughter of William the Conqueror.
He was the older brother of Theobald II, Count of Champagne, King Stephen of England and Henry, Bishop of Winchester.
In the absence of male issue to Henry I, William was the eldest legitimate grandson of William the Conqueror.
He would thus have been the principal rival to Henry's daughter Matilda to inherit the throne after Henry's death.
However, he was not considered as a candidate for the English crown.
Several historians have taken the view that he was passed over because of mental deficiency; hence his soubriquet "William the Simple".
Though widely argued, this has never been clearly substantiated.
William was at first groomed to inherit the comital thrones of Blois and Chartres, and was designated count shortly before his father's departure on his second crusade in 1102.
However he was soon removed from wide-ranging comital duties by his mother, because of his erratic behaviour.
He once assaulted and threatened to kill the Bishop of Chartres over a jurisdictional dispute.
So, when her second son Theobald came of age, around 1107, Adela elevated him to the position of count of Blois-Chartres, and forced William to retire to his wife's lands in Sully.
William Busac
William Busac( 1020- 1076), son of William I, Count of Eu, and his wife Lesceline.
Count of Eu, Count of Soissons," de jure uxoris".
William was given the nickname Busac by the medieval chronicler Robert of Torigni.
William appealed to King Henry
I of France, who gave him in marriage Adelaide, the heiress of the county of Soissons.
Adelaide was daughter of Renaud I, Count of Soissons, and Grand Master of the Hotel de France.
William then became Count of Soissons in right of his wife.
William and Adelaide had four children:
His son Renaud became Count of Soissons upon William ’s death, and he was succeeded by his brother John.
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.

Question: Which country William, Count Of Sully's father is from?