Son of a military officer. His family exepected a military life for Bertrand, but he was drawn to religion, joined the canons of Toulouse, and became an archdeacon. Bishop of Comminges, France c.1075, a position he served for nearly 50 years; this area is part of the modern diocese of Toulouse. Reformed the clergy, enforced their discipline, and placed the cathedral canons under Augustinian Rule. Worked in the Synod of Poitiers in 1100; this synod excommunicated King Philip I, and were stoned by the public for their trouble. Helped preside at the consecration of the cemetery of Saint Mary at Auch during which some embittered monks from Saint Orens tried to burn down the church.
Once during a sermon at Val d’Azun, Bertrand was particularly forceful in taking the faithful to task for their sins. A near riot broke out, which Bertrand calmed before serious problems occurred. To make up for the disturbance, the local leaders agreed to provide free butter to Comminges every year during the week after Pentecost, a custom that continued until stopped by the French Revolution nearly 700 years later.
- 1123 of natural causes