In 1970, Roquebert wrote the first volume of L'Épopée cathare, which won the Grand Prix Robert of the Académie Française.
In this group, he helped resurface the south facade of the village's castle, restoring it to its original elevation.
The fifth and final volume of L'Épopée cathare was written in 1998, totalling more than 3000 pages over the five editions.
Roquebert was elected into the Société archéologique du Midi de la France in 1971.
In 2001, he became a corresponding member of the Académie des sciences, inscriptions et belles-lettres de Toulouse.