Henry, Duke of Lower Lorraine
Henry I (– c. 1119) was the count of Limburg and Arlon from 1082 to his death and duke of Lower Lorraine between 1101 and 1106.
He was the son of Waleran I of Limburg and Jutta, daughter of Frederick, Duke of Lower Lorraine.
He opposed Egilbert, Archbishop of Trier, and took back some property which the former Countess Adela had given to the church.
Egilbert summoned him to return them, but he refused and was excommunicated.
Egilbert took up arms and seriously defeated him.
As advocate of the abbey of Sint-Truiden, a title he had inherited from his father, he intervened in the internal affairs of the abbey.
The abbot Herman, named by Poppo, Bishop of Metz, and supported by Godfrey of Bouillon and Henry, fell out with the Emperor Henry IV and the abbey was transferred to the authority of Arnold, Count of Loon.
Arnold forced Henry and Godfrey to withdraw from the monastery.
After many local nobles left on the First Crusade, among them Godfrey, Henry's power in the region of Belgica was greatly increased and he abused it, especially against the monasteries.
The emperor intervened and took Limburg in July 1101.
Henry was now forced to make submission and he was granted the duchy of Lower Lorraine, which Godfrey had abandoned on Crusade.
As duke, he fell into competition with Godfrey I of Louvain.
He demonstrated little in the way of loyalty to the emperor either.
He joined Henry V against his father the emperor, but then turned back to the emperor's side.
This was unfortunate for the duke, for the emperor died in 1106 and the partisans of Henry V attacked those of his father.
The fields of Belgica were devastated, Limburg was taken, and Henry was imprisoned in Hildesheim.
The duchy was transferred to Godfrey of Louvain.
Henry later escaped and tried to retake Limburg and Lower Lorraine.
He failed and made peace with the new emperor and duke.
He continued nevertheless to employ the ducal title as "Duke of Limburg," the first of a long line.
He also readily joined revolts against Henry V, fighting at the side of Lothair, Duke of Saxony at the victories of Andernach in 1114 and Welphesholt on 11 February 1115.
He was succeeded by his son Waleran.
He married Adelaide of Pottenstein (1061–1106), a daughter of Botho of Pottenstein (or "Potenstein") and Judith, the daughter of Otto III, Duke of Swabia.
They had the aforementioned Waleran and three daughters.
One daughter, Adelaide, married Conrad I, Duke of Merania.
Henry may also have been the father of Simon, Constable of Jerusalem after the First Crusade.
Gothelo II of Lower Lorraine
Gothelo II( also Gozelo)( 1008 – 1046), variously called" the Cowardthe Sluggardthe Indolent", or" the Lazy"( Latin" ignavus"), has been often said to be Duke of Lower Lorraine after the death of his father Gothelo I, Duke of both Lower and Upper Lorraine( 1044) until his own death in 1046.
When Gothelo I died in 1044, Godfrey III, his eldest son, who had been co-ruling in Lower Lorraine for several years, was not given Lower Lorraine by the Emperor Henry III.
Henry first threatened to give Lower Lorraine to the second son Gothelo( not known for his courage or competency and who was perhaps mentally deficient).
Godfrey rebelled and was imprisoned.
Henry appointed Frederick of Luxembourg to succeed in Lower Lorraine.
The date of Gothelo II's death has been disputed.
The homonymy between father and son and the imprecision of the documents( including the fact that not all mention him) have made his role in the duchy of Lower Lorraine debatable.
Richar, Duke of Lower Lorraine
Richar( or Richer)( died 973) was the count of Mons from 963 or 964 and vice- duke of Lower Lorraine from 968.
He was also Count of Liege.
After the death of Godfrey I, count of Hainault and vice- duke of Lower Lorraine, the Emperor Otto I gave Richar half of the county of Hainault( Mons) with the title of count of Hainault.
The regions of Valenciennes was given to Amaury.
He was also given the county of Liège.
He appears in a charter of 2 June 965 donating money in memory of Godfrey.
He was a relation of both the emperor and his brother, Bruno of Cologne, the duke of Lorraine.
He last appears in charters in 972.
The name of Richar's wife is unknown.
They had at least one child: Upon his death, Richar, was succeeded as Count of Mons by Renaud.
The next recorded Duke of Lower Lorraine is Charles, who began his rule in 977.
The position of Duke of Lower Lorraine remained vacant between Richar's death and Charles' ascent.
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:
Waleran, Duke of Lower Lorraine
Waleran II (or Walram II) (1085 – 1139), called "Paganus" meaning "the Pagan", probably due to a late baptism, was the Duke of Limburg and Count of Arlon  from his father's death in about 1119 until his own twenty years later.
He was given the Duchy of Lower Lorraine by Lothair of Supplinburg in 1128 after the latter's accession as King of Germany in 1125.
He was the son of Henry, Duke of Lower Lorraine (1101–1106), and Adelaide of Pottenstein (Adelheid von Botenstein).
Henry had been forced to yield the duchy to Godfrey I of Leuven on Henry V's succession, but had kept the ducal title.
With the coming of Lothair, Godfrey was forced to yield it to Waleran.
Godfrey was not willing to do so and war broke out, especially over disputes about authority over the abbey of Sint-Truiden.
In 1129, Waleran and the bishop of Liège, Alexandre de Juliers, demolished Godfrey's forces at Wilde.
His rule was actual from there on.
Though Waleran and Godfrey eventually reconciled, Godfrey maintained, as Henry had, the ducal title.
He married Jutta von Wassenberg sometime between 1107–10, daughter of Gerard I of Guelders.
In 1129, Waleran was made forester of Duisbourg.
In 1139, Lothair died and Waleran supported Conrad of Hohenstaufen, who was elected.
He remained faithful to the new king until his death shortly thereafter.
He was succeeded by Godfrey II of Leuven in Lorraine.
Waleran and Jutta had:
Ida of Lorraine
Ida of Lorraine( also referred to as Blessed Ida of Boulogne)( c. 1040 – 13 April 1113) was a saint and noblewoman.
She was the daughter of Godfrey III, Duke of Lower Lorraine and his wife Doda.
Ida's grandfather was Gothelo I, Duke of Lorraine and Ida's brother was Godfrey IV, Duke of Lower Lorraine.
Godfrey III, Duke of Lower Lorraine
Godfrey III (–1069), called the Bearded, was the eldest son of Gothelo I, Duke of Upper and Lower Lorraine.
By inheritance, he was Count of Verdun and he became Margrave of Antwerp as a vassal of the Duke of Lower Lorraine.
The Holy Roman Emperor Henry III authorized him to succeed his father as Duke of Upper Lorraine in 1044, but refused him the ducal title in Lower Lorraine, for he feared the power of a united duchy.
Instead Henry threatened to appoint a younger son, Gothelo, as Duke in Lower Lorraine.
At a much later date, Godfrey became Duke of Lower Lorraine, but he had lost the upper duchy by that point in time.
Godfrey rebelled against his King and devastated land in Lower Lorraine, as well as the City of Verdun; which, though his by inheritance, Henry had not given him.
He was soon defeated by an imperial army, deposed and imprisoned together with his son (Gibichenstein, 1045).
When his son died in prison, the war recommenced.
Baldwin V of Flanders joined Godfrey and Henry gave Thierry, Bishop of Verdun, the eponymous county.
Godfrey surprised the Bishop (who escaped) and sacked Verdun, burning the cathedral.
On 11 November 1048 at Thuin, Godfrey fell on Adalbert, his replacement in Upper Lorraine, and defeated him, killing him in battle.
Henry immediately nominated the young Gerard of Chatenoy to replace Adalbert at the Diet of Worms.
In his subsequent campaigns to take the Moselle region, Godfrey met with stiff resistance from Gerard and was forced to renounce his claims and reconcile with the Bishop.
He even assisted in rebuilding the cathedral he had destroyed.
In 1053, his first wife Doda having died, Godfrey remarried Beatrice of Bar, the widow of Boniface III of Tuscany and mother of Matilda, Boniface's heir.
Henry arrested Beatrice and her young son Frederick and imprisoned her in Germany, separate from either husband or son, who died within days.
The emperor claimed the marriage had been contracted without his consent and was invalid.
Young Frederick died a short while later.
Nevertheless, Godfrey took over the government of the Tuscany in right of Beatrice and Matilda.
Baldwin V then rebelled, carrying the war to Trier and Nijmegen.
Henry responded by devastating Flanders and ravaging Lille and Tournai (1054).
In this war, Godfrey captured Frederick of Luxembourg, Duke of Lower Lorraine, who had received that duchy, including Antwerp, from Henry III.
In 1055, Godfrey besieged Antwerp, but Frederick was delivered by the Lorrainers, no longer loyal to Godfrey.
Henry died in 1056 and his successor, Henry IV, was only six years old.
In that year, Baldwin made peace and did homage to the new King.
In 1056 and 1059, by the treaties of Andernach, Baldwin received the March of Ename in the Landgraviate of Brabant, probably in exchange for giving up the March of Valenciennes, which was confiscated by Emperor Henry III in 1045.
In 1057, Godfrey was exiled to Tuscany, where he joined Beatrice and co-governed with her.
He was enfeoffed with the Duchy of Spoleto (1057) by Pope Stephen IX, his brother.
In January 1058, Leo de Benedicto Christiano threw open the city gates to him and Beatrice after the election of Pope Nicholas II.
Possessing the Tiber and assaulting the Lateran, Godfrey succeeded in expelling the antipope Benedict X on 24 January.
During the papal reign of his brother and his brother's reforming successors, he played an important role in the politics of central and northern Italy, including Sardinia, where he interfered on behalf of Barisone I of Logudoro against the Republic of Pisa, indicating his authority over both.
In 1065, he was recalled to become Duke of Lower Lorraine after the death of Frederick.
He was also given Antwerp again.
He installed his court at Bouillon and died on Christmas Eve 1069.
Alexander of Jülich
Alexander I( called" of Jülich") was the prince- bishop of Liège from 1128 to 1134.
As bishop, he received Pope Innocent II, Emperor Lothair II, and Bernard of Clairvaux.
As prince, he was a warrior, taking part in the wars of Waleran, Duke of Lower Lorraine against Godfrey I of Leuven.
Gerberga of Lower Lorraine
Gerberga of Lower Lorraine, Countess of Louvain, was the daughter of Charles, Duke of Lower Lorraine, himself the son of Louis IV of France and Gerberga of Saxony.
Henry II, Duke of Limburg
Henry II( – August 1167) was the duke of Limburg from 1139 and count of Arlon from 1147 to his death.
He was the son of Waleran, Duke of Lower Lorraine, and Jutta of Guelders, daughter of Gerard I of Guelders.
He succeeded his father in Limburg with the title of duke, but Conrad III refused to grant him Lower Lorraine.
He continued to style himself as duke nevertheless.

Question: Who is the paternal grandfather of Waleran, Duke Of Lower Lorraine?
Answer: Waleran I of Limburg