Adelaide of Leuven
Adelaide of Leuven( died) was the wife of Simon I, Duke of Lorraine( 1076 – 1138), in what is now France.
She was the daughter of Henry III of Leuven and his wife Gertrude of Flanders.
After the death of her husband, Adelaide retired to Tart Abbey.
The children of Simon I and Adelaide included:
Hubba bint Hulail
Hubba bint Hulail was the grandmother of Hashim ibn' Abd Manaf, thus the great- great- great- grandmother of the Islamic" Nabī"( Prophet) Muhammad ibn Abdullah.
Nicolas, Duke of Mercœur
Nicolas of Lorraine, Duke of Mercœur (16 October 1524 – 23 January 1577) was the second son of Antoine, Duke of Lorraine and Renée de Bourbon.
Hannah Arnold
Hannah Arnold, also known as Hannah Waterman King, was the grandmother of Benedict Arnolds children.
Hedwig of Formbach
Hedwig of Formbach (c.1058 – c.1090), was the daughter of Frederick, count of Formbach and of Gertrude of Haldensleben, and heiress to Süpplingenburg Castle.
She was the mother of Emperor Lothair II.
Agatha of Lorraine
Agatha of Lorraine (c. 1120 – April 1147) was the wife of Renaud III, Count of Burgundy.
She was the daughter of Simon I, Duke of Lorraine and his wife Adelaide of Leuven.
Agatha's children with her husband included:
She fell sick in March 1147 and died two weeks later.
Charles Henri, Prince of Commercy
Charles Henri of Lorraine( 17 April 1649 – 14 January 1723) was the legitimated son of Charles IV, Duke of Lorraine, and Béatrix de Cusance.
He was given the Principality of Commercy in 1708 by his cousin Leopold, Duke of Lorraine.
He was also the Count of Falkenstein.
Bertha, Duchess of Lorraine
Bertha of Lorraine( or Bertha of Swabia)( b.c. 1123/30 – d. 1194/ 5) was a member of the Hohenstaufen dynasty.
She was the daughter of Frederick II, Duke of Swabia and, through marriage to Matthias I duke of Lorraine, she was duchess of Lorraine( c.1138-1176).
Simon I, Duke of Lorraine
Simon I (1076 – 13 or 14 January 1139) was the duke of Lorraine from 1115 to his death, the eldest son and successor of Theodoric II and Hedwig of Formbach.
Continuing the policy of friendship with the Holy Roman Emperor, he accompanied the Emperor Henry V to the Diet of Worms of 1122, where the Investiture Controversy was resolved.
He had stormy relations with the episcopates of his realm: fighting with Stephen of Bar, bishop of Metz, and Adalberon, archbishop of Trier, both allies of the count of Bar, whose claim to Lorraine against Simon's father had been quashed by Henry V's father Henry IV.
Though Adalberon excommunicated him, Pope Innocent II lifted it.
He was a friend of Bernard of Clairvaux
and he built many abbeys in his duchy, including that of Sturzelbronn in 1135.
There was he interred after his original burial in Saint-Dié.
Claude Françoise de Lorraine
Claude of Lorraine (6 October 1612 – 2 August 1648) was a daughter of Henry II, Duke of Lorraine, and Margerita Gonzaga, her sister was Nicole, Duchess of Lorraine.
She married her first cousin and was the Duchess of Lorraine by marriage.

Question: Who is Simon I, Duke Of Lorraine's maternal grandmother?
Answer: Gertrude of Haldensleben