Question: Who is Felicia Of Roucy's mother-in-law?

Knowledge 1: Felicia of Roucy
Felicia of Roucy (– 3 May 1123) was a queen consort of Aragon and Navarre.She was a daughter of Hilduin IV of Montdidier and his wife Alice of Roucy.She was married in 1076 to Sancho Ramírez, then king of Aragon after he had divorced his first wife, Isabella of Urgell.His accession to the crown of Navarre later that year made her the first Aragonese consort to also be Queen consort of Navarre.She is attested shortly before her husband's death and is now thought to have outlived Sancho (the supposed subsequent marriage of Sancho to a third wife, Philippa of Toulouse, appearing in a later chronicle, is now thought to be erroneous).Felicia gave birth to three sons, Ferdinand, Alfonso and Ramiro, the latter two following her step-son Peter I of Aragon and Navarre in Aragon (Alfonso also in Navarre).Through Ramiro's only daughter Petronila of Aragon, she was ancestor of the later rulers of Aragon. [SEP] Knowledge 2: Sancho Ramírez
Sancho Ramírez (1042 – 4 June, 1094) was King of Aragon from 1063 until 1094 and King of Pamplona from 1076 under the name of Sancho V .He was the eldest son of Ramiro I and Ermesinda of Bigorre.His father was the first king of Aragon and an illegitimate son of Sancho III of Pamplona.He inherited the Aragonese crown from his father in 1063.Sancho Ramírez was chosen king of Pamplona by Navarrese noblemen after Sancho IV was murdered by his siblings.
Knowledge 1: Ebles I of Roucy
Ebles I of Roucy( died 11 May 1033) was count of Roucy from 1000 to 1033 and archbishop of Reims from 1021 to 1033.His father has traditionally been considered to have been Giselbert, Count of Roucy and Reims.A by Jean- Noël Mathieu resolves some inconsistencies by instead placing Giselbert as his matrilineal great uncle, and Eble de Poitiers as his father.He married Beatrix, the daughter of Reginar IV, Count of Mons and Hedwig of France( daughter of Hugh Capet). [SEP] Knowledge 2: Gilbert of Roucy
Gilbert( also Giselbert or Gislebert), Count of Reims& Roucy, was the son of Renaud, Count of Reims and Alberade of Lorraine, daughter of Gilbert, Duke of Lorraine.Although his wife's name is unknown, she was likely from the family of the Poitiers.He was Count of Roucy from 967 until his death, and Viscount of Reims.He was probably still a child when his father died.He inherited the County of Roucy from his father, but the County of Reims was entrusted to Herbert “ le Vieux ” III of Osmois.Later, Eudes I, Count of Blois, and the successor to Herbert le Vieux, entrusted Giselbert with the Viscouncy of Reims.In 987, upon the death of King Louis V, Giselbert rallied without difficulty to his successor Hugh Capet, but nevertheless agreed to take an oath of allegiance in 990 to Charles of Lorraine, when the latter pressed his claims to the throne.He died on April 19 between 991 and 1000, perhaps in 997, and was buried in the abbey of Saint- Remi of Reims.No contemporary document mentions a wife or children for Giselbert.His successor was Ebles I Count of Roucy.It was long thought Ebles I was the son of Giselbert and to explain the appearance of the Ebles name in the house of Roucy, a daughter of the Duke of Aquitaine, William III “ Towhead ”, from the house of Poitiers.According to this hypothesis, and knowing the names of the brothers and sister of Ebles I, Giselbert and this princess of Aquitaine would be the parents of:But a recent study, based on onomastic data( the first names of Eudes and Lietaud are unexplained by the conventional theory) and patrimony( the lands of Rumigny and Marle, previously owned by the Counts of Blois) proposed a new theory: that Ebles I of Roucy was the son of Ebles I of Poitiers,( himself the son of William IV of Poitiers and Emma de Blois) and a daughter of, and Ermentrude of Roucy, Giselbert of Roucy ’s sister.
Knowledge 1: Sancho Ramírez
Sancho Ramírez (1042 – 4 June, 1094) was King of Aragon from 1063 until 1094 and King of Pamplona from 1076 under the name of Sancho V .He was the eldest son of Ramiro I and Ermesinda of Bigorre.His father was the first king of Aragon and an illegitimate son of Sancho III of Pamplona.He inherited the Aragonese crown from his father in 1063.Sancho Ramírez was chosen king of Pamplona by Navarrese noblemen after Sancho IV was murdered by his siblings. [SEP] Knowledge 2: Gilbert of Roucy
Gilbert( also Giselbert or Gislebert), Count of Reims& Roucy, was the son of Renaud, Count of Reims and Alberade of Lorraine, daughter of Gilbert, Duke of Lorraine.Although his wife's name is unknown, she was likely from the family of the Poitiers.He was Count of Roucy from 967 until his death, and Viscount of Reims.He was probably still a child when his father died.He inherited the County of Roucy from his father, but the County of Reims was entrusted to Herbert “ le Vieux ” III of Osmois.Later, Eudes I, Count of Blois, and the successor to Herbert le Vieux, entrusted Giselbert with the Viscouncy of Reims.In 987, upon the death of King Louis V, Giselbert rallied without difficulty to his successor Hugh Capet, but nevertheless agreed to take an oath of allegiance in 990 to Charles of Lorraine, when the latter pressed his claims to the throne.He died on April 19 between 991 and 1000, perhaps in 997, and was buried in the abbey of Saint- Remi of Reims.No contemporary document mentions a wife or children for Giselbert.His successor was Ebles I Count of Roucy.It was long thought Ebles I was the son of Giselbert and to explain the appearance of the Ebles name in the house of Roucy, a daughter of the Duke of Aquitaine, William III “ Towhead ”, from the house of Poitiers.According to this hypothesis, and knowing the names of the brothers and sister of Ebles I, Giselbert and this princess of Aquitaine would be the parents of:But a recent study, based on onomastic data( the first names of Eudes and Lietaud are unexplained by the conventional theory) and patrimony( the lands of Rumigny and Marle, previously owned by the Counts of Blois) proposed a new theory: that Ebles I of Roucy was the son of Ebles I of Poitiers,( himself the son of William IV of Poitiers and Emma de Blois) and a daughter of, and Ermentrude of Roucy, Giselbert of Roucy ’s sister.

Answer: Ermesinda of Bigorre