Question: Who is the stepfather of Peter I Of Aragon And Pamplona?

Knowledge 1: 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." [SEP] Knowledge 2: Isabella of Urgell
Isabella of Urgel(Aragonese: "Isabel d'Urchel"; died 1071) was Queen of Aragon; the only daughter of Ermengol III, Count of Urgell by his first wife Adelaide of Besalú.Isabella is mentioned in her brother Ermengol IV's testament.Isabella married in 1065 King Sancho Ramírez; by this marriage, Isabella was Queen of Aragon.The couple had one son, Peter I, Sancho's successor who left no surviving children.The couple divorced in 1070, and both remarried.Isabella may have become the second wife of William I, Count of Cerdanya in 1071.
Knowledge 1: 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." [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: 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." [SEP] Knowledge 2: Isabella of Aragon, Countess of Urgell
Isabella of Aragon( 1376, Barcelona – 1424) was a daughter of Peter IV of Aragon and his fourth wife, Sibila of Fortia.She was infanta of Aragon and Countess of Urgel.

Answer: William I, Count of Cerdanya