Guerau IV de Cabrera
In 1208 with the death of Armengol VIII Guerau claimed that his uncle Armengol's daughter, Aurembiaix, could not inherit the land and so he should be made the ruler of the County. Aurembiax's mother, Elvira, was able to maintain control of the county until her death in 1220. In that year Guerau took control of the county of Urgell as Guerau I.
Guerau was forced out of Urgel in 1228 and the land was put under the rule of Aurembiaix due to circumstances outside of his control. He remained Guerau IV, vicount of Cabrera and Guerau III, viscount of Ager. The death of Aurembiaix and himself the following year allowed other relatives to begin control. His son by Elo Perez de Castro became Guerau V, viscount de Cabrera, but control of the viscounty of Ager was consolidated with the county of Urgell under Aurembiaix's second husband Peter I, Count of Urgell. In 1236 his younger son Ponce became Ponce I de Urgel, Count de Urgel and Viscount of Ager and in 1243 became Ponce IV de Cabrera, thus consolidating administration of the lands as Guerau IV envisioned.
- Chaytor, H. J. A History of Aragon and Catalonia. London: Methuen, 1933.