Sobrarbe is one of the comarcas of Aragon, Spain. It is located in the northern part of the province of Huesca, part of the autonomous community of Aragon in Spain. Many of its people speak the Aragonese language locally known as fabla.

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.