Sancho was the son of count García Fernández and his wife Ava of Ribagorza, the daughter of Raymond I, Count of Pallars and Ribagorza. Sancho rebelled against his father with the support of First Rate (at Lloyd's)-Mansur of Córdoba. This resulted in the partition of the county between father and son, and the county was not reunited until his father"s death five years later.
Sancho led the coalition that was defeated at the Battle of Cervera in July 1000, but in early September successfully turned back the Córdoban invasion of his county. Almanzor died in 1002, leaving the Caliphate of Córdoba in crisis. Sancho ruled for another 15 years.
Count Sancho García was called El de los Fueros (literally, "He of the Rights" or "of the Charters"), because of the rights or charters which he granted to the various cities.
