Henry I, Count of Louvain
Henry I was Count of Louvain from 1015 until 1038.
Lambert II, Count of Lens
Lambert II, Count of Lens( died 1054) was a French nobleman.
He was likely born circa 1030.
This would put his death age at about 24 years old.
He was the son of Eustace I, Count of Bologne and of Maud of Louvain( daughter of Lambert I of Louvain).
he married Adelaide of Normandy, Countess of Aumale, daughter of Robert I, Duke of Normandy and sister of William the Conqueror.
Adelaide was the widow of Enguerrand II, Count of Ponthieu who died in 1053.
Lambert and Adelaide had a daughter, Judith of Lens, although Lambert would scarcely have seen her; he was killed at the battle of Lille in 1054.
Lambert was supporting Baldwin V, Count of Flanders against Henry III, Holy Roman Emperor when he was killed in battle.
His widow, Adelaide, married thirdly, Odo, Count of Champagne.
Raoul II of Nesle
Raoul II of Nesle( died 1160), son of Raoul I, Seigneur of Nesle, and his wife Rainurde.
Châtelain of Nesle and Bruges.
Third generation of the House of Nesle.
Raoul was brother to Yves II, Count of Soissons, and supported his donation of the chapel of Beaulieu to the abbey of Soissons( presumably the Abbey of St. Medard, Soissons, rebuilt in 1131 by Pope Innocent II).
Raoul was allied with Thierry, Count of Flanders, and signed a charter in which the latter donated property to the town of Saint- Omer.
Raoul married Gertrude de Montaigu, daughter of Lambert, Count of Montaigu and Clermont, and his wife[ either the daughter of Henry III, Count of Louvain, or Giselbert, Count of Clermont].
Raoul and Gertrude had four children:
The children of Raoul and Gertrude were members of both the House of Nesle and the House of Clermont.
Henry II, Count of Louvain
Henry II( German:" Heinrich", Dutch:" Hendrik", French:" Henri") was Count of Louvain( Leuven) from 1054 through 1071.
Henry II was the son of Lambert II, Count of Louvain and Oda of Verdun.
His maternal uncles included Pope Stephen X and Godfrey the Bearded, Duke of Lorraine.
Otto I, Margrave of Meissen
Otto I was the Margrave of Meissen from 1062 until his death in 1067, and the second Margrave of the family of the counts of Weimar and Orlamünde.
He was a younger son of William III of Weimar and Oda, daughter of Thietmar, Margrave of the Saxon Ostmark.
He inherited Orlamünde from his father in 1039 and Weimar from his brother William in 1062.
He was appointed by the Emperor Henry IV to succeed William in Meissen as well.
He became Advocate of the Cathedral of Merseburg in 1066.
He married Adela of Louvain, daughter of Lambert II, Count of Louvain, son of Lambert I of Louvain, before 1060.
She gave him three daughters:
When he died, she remarried to Dedi I of Lusatia, Otto's stepfather.
Henry III, Count of Louvain
Henry III of Louvain( German:" Heinrich", Dutch:" Hendrik", French:" Henri"; died 1095), was count of Louvain( Leuven) and landgrave of Brabant, son of Henry II( c. 1020 – 1078), count of Louvain and Brussels, and Adela of Orthen( or Betuwe), a daughter of Count Everard of Orthen.
Lambert I, Count of Louvain
Lambert I of Louvain nicknamed
"The Bearded" (born in Louvain, Duchy of Lotharingia, East Francia c. 950, died in Florennes, County of Namur, Duchy of Lower Lorraine, Holy Roman Empire on 12 September 1015) was the first Count of Louvain in 1003.
He was killed by Godfrey II, Duke of Lower Lorraine in battle for Godfrey's claim of Count of Verdun.
He was the son of Reginar III, Count of Hainaut and Adela d'
Eguisheim, daughter of Hugh V, Count of Eguisheim.
His brother was Reginar IV, Count of Mons.
He was the husband of Gerberga of Lower Lorraine, and father of:
Reginar III, Count of Hainaut
Reginar III (c. 920 – 973) was a Count of Hainaut from approximately 940 until his exile in 958.
He was the son of Reginar II, Count of Hainaut.
He took part in the rebellion of his uncle Gilbert, Duke of Lorraine.
When Gilbert was killed in 939, Regnier had to pledge fealty to King Otto the Great.
He then allied himself with King Louis IV of France, but King Otto sent duke Hermann of Swabia to quell the rebels in 944.
Otto appointed Conrad the Red as duke of Lotharingia, who tried to diminish the power of Reginar.
However, when Conrad rose against Otto, Reginar supported him.
In an anarchic situation, Reginar appropriated the dowry of Gerberga of Saxony, Otto's sister and mother of the French king, and also church property.
In 953, Bruno, Archbishop of Cologne, who had also been appointed duke of Lotharingia, restored order and defeated Reginar.
As Reginar refused to submit, he was exiled to Bohemia, where he died.
Conon, Count of Soissons
Conon of Nesle( died 1180), son of Raoul II of Nesle and Gertrude, daughter of Lambert, Count of Montaigu.
Châtelain of Bruges, Count of Soissons.
Conon became Count of Soissons upon the death of his uncle Yves II in 1178.
In 1164, Conon married Agather of Pierrefonds, daughter of Dreux, Seigneur of Perrefonds, and his wife Beatrix.
They had no children.
Upon his death in 1180, Conon was succeeded as Count of Soissons by his brother Raoul.
Sigramnus, Count of Hesbaye
Sigramnus (Sigrand), was the Count of Hesbaye.
Sigramnus became Count of Hesbaye by virtue of his marriage to the daughter of Lambert, Count of Hesbaye.
The dates of his rule are unknown but are believed to be between that of Lambert’s son and grandson, and so it was perhaps an interim position until the latter became of age.
The only knowledge available on Sigramnus is through his son, the Bishop of Metz, and grandson Ingerman of Hesbaye, father of Ermengard, wife of Louis the Pious.
Sigramnus is known to have been an early supporter of Charles Martel, even before the Battle of Amblève.
Sigramnus married , daughter of Lambert, Count of Hesbaye.
They had three children:
Previous histories have portrayed Sigramnus as the husband of the daughter of Charles Martel, but this has been largely discredited.
Sigramnus was succeeded by his nephew Cancor as Count of Hesbaye.

Question: Who is the paternal grandfather of Lambert I, Count Of Louvain?
Answer: Reginar II, Count of Hainaut