Question: Who is the paternal grandmother of Louis, Count Of Verdun?

Knowledge 1: Louis, Count of Verdun
Louis I (murdered September 29, 1025), Count of Chiny (987-1025) and Count of Verdun (as Louis) (1024-1025), son of Otto I, Count of Chiny, and an unknown mother.
Upon Otto’s death, Louis became the second Count of Chiny.Virtually nothing is known about his rule in Chiny.In 1024, Reginbert, the Bishop of Verdun, appointed Louis as Count of Verdun when Count Herman of Ename, son of Godfrey the Prisoner, retired to a monastery.Herman's nephew, Godfrey the Bearded, coveted the position, and Gothelo (Herman’s brother and Godfrey’s father) invaded the city and murdered Louis.Louis married Adelaide (d. after 1025), of unknown parentage.They had two children:
Louis’ son Louis II assumed the position of Count of Chiny after his father’s death, and Godfrey the Bearded was appointed Count of Verdun. [SEP] Knowledge 2: Otto I, Count of Chiny
Otto I (Eudes) (d. 987), Count of Chiny, perhaps son of Adalbert I the Pious, Count of Vermandois, and Gerberge of Lorraine.Although he probably did not use the title, Otto is regarded as the first Count of Chiny.Historically, an Otto of Vermandois is mentioned in a charter of 958 alongside his father, the Count of Vermandois.His name and that of his brother Ludolfe show a Germanic ancestry of the kings of the family of Saxony, which is indeed the case, as his mother is Gerberge of Lorraine, niece of Emperor Otto I (her mother being daughter to Henry the Fowler).He was reported as a quarrelsome lord who threatened Hainaut and Cambrésis (the region around Cambrai).In 971, an Otto erected a fortress in Warcq, in the Ardennes, and attacked his neighbors, including Adalbero, Archbishop of Reims.He is mentioned as having imperial ancestry.This and a number of other facts prompted the historian Léon Vanderkindere to hypothesize that these two Ottos were in fact a single historical figure.His wife’s name is unknown.It is possible that she was from Ardennes, a relative of Wigeric of Lotharingia and Cunigunda of France, granddaughter of Louis the Stammerer.This could explain the name of his son and the appointment of the latter as Count of Verdun in 1024.Otto and his wife had one child:
Upon his death, Otto was succeeded as Count of Chiny by his son Louis.
Knowledge 1: Louis, Count of Verdun
Louis I (murdered September 29, 1025), Count of Chiny (987-1025) and Count of Verdun (as Louis) (1024-1025), son of Otto I, Count of Chiny, and an unknown mother.
Upon Otto’s death, Louis became the second Count of Chiny.Virtually nothing is known about his rule in Chiny.In 1024, Reginbert, the Bishop of Verdun, appointed Louis as Count of Verdun when Count Herman of Ename, son of Godfrey the Prisoner, retired to a monastery.Herman's nephew, Godfrey the Bearded, coveted the position, and Gothelo (Herman’s brother and Godfrey’s father) invaded the city and murdered Louis.Louis married Adelaide (d. after 1025), of unknown parentage.They had two children:
Louis’ son Louis II assumed the position of Count of Chiny after his father’s death, and Godfrey the Bearded was appointed Count of Verdun. [SEP] Knowledge 2: Louis II, Count of Chiny
Louis II (d. before 1066), Count of Chiny (1025–1066), son of Louis I, Count of Chiny and Verdun, and Adélaïde de Saint Varme.He left very few traces in history and nothing is known about his reign.Louis was married to Sophie.They had two children:
Legend has it that Louis held hunting parties in his huge game park.Here, Thibault of Champagne established a hermitage and found a source of holy springs, and Louis built a shrine to the spring's healing powers.The shrine became famous, with many pilgrims who came to implore the grace of Saint-Thibault.Later, monks from Calabria, Italy, founded a monastery nearby at Orval at the invitation of Louis’ son Arnold.Upon Louis' death, his son Arnold became Count of Chiny.
Knowledge 1: Otto I, Count of Chiny
Otto I (Eudes) (d. 987), Count of Chiny, perhaps son of Adalbert I the Pious, Count of Vermandois, and Gerberge of Lorraine.Although he probably did not use the title, Otto is regarded as the first Count of Chiny.Historically, an Otto of Vermandois is mentioned in a charter of 958 alongside his father, the Count of Vermandois.His name and that of his brother Ludolfe show a Germanic ancestry of the kings of the family of Saxony, which is indeed the case, as his mother is Gerberge of Lorraine, niece of Emperor Otto I (her mother being daughter to Henry the Fowler).He was reported as a quarrelsome lord who threatened Hainaut and Cambrésis (the region around Cambrai).In 971, an Otto erected a fortress in Warcq, in the Ardennes, and attacked his neighbors, including Adalbero, Archbishop of Reims.He is mentioned as having imperial ancestry.This and a number of other facts prompted the historian Léon Vanderkindere to hypothesize that these two Ottos were in fact a single historical figure.His wife’s name is unknown.It is possible that she was from Ardennes, a relative of Wigeric of Lotharingia and Cunigunda of France, granddaughter of Louis the Stammerer.This could explain the name of his son and the appointment of the latter as Count of Verdun in 1024.Otto and his wife had one child:
Upon his death, Otto was succeeded as Count of Chiny by his son Louis. [SEP] Knowledge 2: Louis II, Count of Chiny
Louis II (d. before 1066), Count of Chiny (1025–1066), son of Louis I, Count of Chiny and Verdun, and Adélaïde de Saint Varme.He left very few traces in history and nothing is known about his reign.Louis was married to Sophie.They had two children:
Legend has it that Louis held hunting parties in his huge game park.Here, Thibault of Champagne established a hermitage and found a source of holy springs, and Louis built a shrine to the spring's healing powers.The shrine became famous, with many pilgrims who came to implore the grace of Saint-Thibault.Later, monks from Calabria, Italy, founded a monastery nearby at Orval at the invitation of Louis’ son Arnold.Upon Louis' death, his son Arnold became Count of Chiny.

Answer: Gerberge of Lorraine