In addition, several of the younger branches of the family of the kings of Aragon established themselves as nobility based in Aragon (Chapter 4).
The names of this family suggest a close relationship with the early dukes of Gascony (see the document GASCONY) but the precise relationship cannot be ascertained from the limited amount of information which is contained in the surviving primary sources. His name is known only from the patronymic attributed to his son.
The 11th and 12th century nobility of the kingdom of Aragon is named in charter subscriptions and dating clauses, set out in Chapter 5. It is extremely difficult to reconstruct noble families successfully for that period as the evidence to prove the inheritance of tenencias within the same families is lacking.Sancti Licerii....vineam que fuit Raimundi patris mei to the monastery of Gerri by charter dated 13 Sep 947The testament of "Isarnus...comes Paliarensis et marchio", dated 13 Sep 953, bequeathes property to "fratris meo Otto episcopo" and to Sanct Mari et Sancti Vincentii Gerrensis cnobii..consilio...Sinegentis comtiss, and places filiam meam Ermengarde in mudeburdo Sanct Mari Gerrensis et Sancti Vincentii, signed by Isarni comitis, Attonis episcopi, Adalpis, Ennecone, Asnero Galindes, Gimerane.Rudimentary genealogies of the three comital families are included in the collection of documents known as the Codex de Roda, written in Navarre in the late 10th century. It is unclear whether any or all of these counties formed part of the so-called "March of Spain" which was established by the Carolingian Frankish monarchs in the early 9th century in the area which later developed into Catalonia (see the document CATALONIA).This document also sets out a small amount of information on the Condes de Bailo (Chapter 1) and the vizcondes de Villamur in the late 12th century (Chapter 2. The process which led to the eventual unification of these counties into the kingdom of Aragon started in  when Sancho III "el Mayor" King of Navarre occupied Ribagorza as part of his territorial expansion.On his death in 1035, his sons shared their father's territories.