Gerberge was the daughter of unknown parents. The date and place of her birth have not been found.
Her husband was Aton III Trencavel. They were married, but the date and place have not been found. Their four known children were Isabelle-Élisabeth (?-1050), Bernard-Aton III (c1010-1060), Frothaire (?-1077) and Segaire (?->1035).