Question: Who is the maternal grandfather of Guiscarda, Viscountess Of Béarn?

Knowledge 1: Guiscarda, Viscountess of Béarn
Guiscarda (or Guiscarde) (died 1154) was the eldest child of Gaston IV of Béarn and Talesa of Aragon.She later succeeded her younger brother Centule VI as viscountess in 1134.Guiscarda first married Peter II of Gabarret, who died before she succeeded to Béarn.Her son by him, Peter II, also succeeded in 1134.Guiscarda's mother acted as primary regent, Guiscarda only secondarily.In 1147, Peter attained his majority and Guiscarda retired from her functions in government.When Peter died in 1153, Guiscarda assumed the regency for his son Gaston V, until her own death the next year. [SEP] Knowledge 2: Talesa of Aragon
Talesa, Talèse, Talèze, or Ataresa (died after 1136) was an Aragonese noblewoman and relative of the royal Jiménez dynasty.She was the daughter of Sancho Ramírez, Count of Ribagorza, natural brother of King Sancho Ramírez of Aragon and Navarre.She married Gaston IV of Béarn and acted as regent of the viscounty of Béarn during his absences on Crusade in 1096-1101, and after his death for their son in 1131-1134.
Knowledge 1: Guiscarda, Viscountess of Béarn
Guiscarda (or Guiscarde) (died 1154) was the eldest child of Gaston IV of Béarn and Talesa of Aragon.She later succeeded her younger brother Centule VI as viscountess in 1134.Guiscarda first married Peter II of Gabarret, who died before she succeeded to Béarn.Her son by him, Peter II, also succeeded in 1134.Guiscarda's mother acted as primary regent, Guiscarda only secondarily.In 1147, Peter attained his majority and Guiscarda retired from her functions in government.When Peter died in 1153, Guiscarda assumed the regency for his son Gaston V, until her own death the next year. [SEP] Knowledge 2: Centule II of Béarn
Centule II of Béarn (French: "Centulle II de Béarn"; died ca. 940) was a Viscount of Béarn in medieval France.He was most likely a son — and successor — of the Viscount Loup Centule, whilst his mother was most likely Loup Centule’s spouse of an unknown name.Centule became a viscount, and he married an unknown woman, who bore him a son, Gaston.Gaston became viscount after his father’s death, and he fathered a son, Centule III of Béarn.
Knowledge 1: Guiscarda, Viscountess of Béarn
Guiscarda (or Guiscarde) (died 1154) was the eldest child of Gaston IV of Béarn and Talesa of Aragon.She later succeeded her younger brother Centule VI as viscountess in 1134.Guiscarda first married Peter II of Gabarret, who died before she succeeded to Béarn.Her son by him, Peter II, also succeeded in 1134.Guiscarda's mother acted as primary regent, Guiscarda only secondarily.In 1147, Peter attained his majority and Guiscarda retired from her functions in government.When Peter died in 1153, Guiscarda assumed the regency for his son Gaston V, until her own death the next year. [SEP] Knowledge 2: Constance of Béarn
Constance (died 1310) was "suo jure" Viscountess of Marsan as well as titular Countess of Bigorre, daughter of Gaston VII, Viscount of Béarn and his first wife Martha of Marsan.Constance inherited all of her titles from her mother and contended to inherit her father's Viscounty of Béarn.She was married three times during her lifetime, marrying into the royal families of Aragon, Castile and England. "

Answer: Sancho Ramírez