Herbert is mentioned for the first time on December 14, 804 in the charter of foundation of the abbey of
Saint-Guilhem-le-Désert with his father
Guillaume de Gellone, and in the company of his brothers
Bernard, Guitcaire, Gaucelme and his uncles Theudouin, Thierry and Alleaume. In 819,
Louis the Pious, who had become emperor in 814, married
Judith of Bavaria, despite the fact that he had three sons from his first marriage. The sons of Guillaume are grouped among the ones supporting of Judith. It has also been theorised that
Emma of Bavaria, Judith's sister, was married in her first marriage to Thierry, son of Guillaume of Gellone. A conflict occurs in August 829, when Louis the Pious decided, at the Worms assembly, to constitute a kingdom for his son
Charles, born of Judith. Louis faced the displayed discontent of his eldest son
Lothaire, whom he exiled to Italy, as well as from his advisor,
Wala de Corbie. Wala decided to spread a rumor of an adulterous union between Judith and Bernard, Herbert's brother, and accused Bernard of taking advantage of the emperor's weakness to govern in his place. Taking advantage of Louis the Pious expedition in
Brittany, his sons
Pepin and
Louis organized a revolt, and they brought Lothair back from
Italy and they took power.
Bernard of Septimanie fled to
Barcelona, while Herbert was blinded. ==Possible descendants==