His uncle, Ponç III of Cabrera, married the daughter of Ermengol VII named Marquesa in 1194.
Through these familial ties to the House of Cabrera, Gerau came to claim the County of Urgell.
Aurembiax's mother, Elvira, was able to maintain control of the county until her death in 1220.
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.