Question: Who is Agnes Of Aquitaine, Queen Of Aragon And Navarre's father-in-law?

Knowledge 1: Agnes of Aquitaine, Queen of Aragon and Navarre
Agnes of Aquitaine (end of 1072 – 6 June 1097) was a daughter of William VIII, Duke of Aquitaine, and his third wife, Hildegarde of Burgundy, and thus half-sister of Agnes of Aquitaine, Queen of Castile, with whom she is sometimes confused.In 1081, Agnes was betrothed to Peter I of Aragon and Navarre.During 1086 in Jaca the couple married, and upon Peter's succession, Agnes became queen of Aragon and Navarre.By him, Agnes had two children, both of whom predeceased their father: Peter (died 1103) and Isabella (died 1104).Agnes died in 1097, and her husband remarried to a woman named Bertha. [SEP] Knowledge 2: Peter I of Aragon and Pamplona
Peter I (1068 - 1104) was King of Aragon and also Pamplona from 1094 until his death in 1104.Peter was the eldest son of Sancho Ramírez, from whom he inherited the crowns of Aragon and Pamplona, and Isabella of Urgell.He was named in honour of Saint Peter, because of his father's special devotion to the Holy See, to which he had made his kingdom a vassal.Peter continued his father's close alliance with the Church and pursued his military thrust south against bordering Al-Andalus taifas with great success, allying with Rodrigo Díaz de Vivar, known as "El Cid", the ruler of Valencia, against the Almoravids.According to the medieval "Annales Compostellani" Peter was "expert in war and daring in initiative", and one modern historian has remarked that "his grasp of the possibilities inherent in the age seems to have been faultless."
Knowledge 1: Agnes of Aquitaine, Queen of Aragon and Navarre
Agnes of Aquitaine (end of 1072 – 6 June 1097) was a daughter of William VIII, Duke of Aquitaine, and his third wife, Hildegarde of Burgundy, and thus half-sister of Agnes of Aquitaine, Queen of Castile, with whom she is sometimes confused.In 1081, Agnes was betrothed to Peter I of Aragon and Navarre.During 1086 in Jaca the couple married, and upon Peter's succession, Agnes became queen of Aragon and Navarre.By him, Agnes had two children, both of whom predeceased their father: Peter (died 1103) and Isabella (died 1104).Agnes died in 1097, and her husband remarried to a woman named Bertha. [SEP] Knowledge 2: Eleanor of Aragon, Queen of Castile
Eleanor of Aragon (20 February 1358 – 13 August 1382) was a daughter of King Peter IV of Aragon and his wife Eleanor of Sicily.She was a member of the House of Aragon and Queen of Castile by her marriage.
Knowledge 1: Agnes of Aquitaine, Queen of Aragon and Navarre
Agnes of Aquitaine (end of 1072 – 6 June 1097) was a daughter of William VIII, Duke of Aquitaine, and his third wife, Hildegarde of Burgundy, and thus half-sister of Agnes of Aquitaine, Queen of Castile, with whom she is sometimes confused.In 1081, Agnes was betrothed to Peter I of Aragon and Navarre.During 1086 in Jaca the couple married, and upon Peter's succession, Agnes became queen of Aragon and Navarre.By him, Agnes had two children, both of whom predeceased their father: Peter (died 1103) and Isabella (died 1104).Agnes died in 1097, and her husband remarried to a woman named Bertha. [SEP] Knowledge 2: 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.

Answer: Sancho Ramírez