Gonzalo Sánchez was the king of Sobrarbe and Ribagorza, two small Pyrenean counties, from 1035 until his death. He was the son of King Sancho III of Navarre and his wife, Muniadona of Castile. Before his death in 1035, Sancho divided his kingdom between his sons, leaving Sobrarbe and Ribagorza to Gonzalo. He governed them as vassal of his elder brother, García Sánchez III, who had inherited Navarre. Gonzalo is thought to have been ineffectual and unpopular, with vassals defecting to his half-brother, Ramiro I of Aragon, during his own lifetime. Within a decade of his death, his reign was being ignored and he was left out of a list of rulers of Ribagorza.

Sancho Garcés III, also known as Sancho the Great, was the King of Pamplona from 1004 until his death in 1035. He also ruled the County of Aragon and by marriage the counties of Castile, Álava and Monzón. He later added the counties of Sobrarbe (1015), Ribagorza (1018) and Cea (1030), and would intervene in the Kingdom of León, taking its eponymous capital city in 1034.