But the museum's greatest treasures are undoubtedly the dukes' tombs in the Salle des Gardes ' brought here from the Charter?­house of Champmol, which was destroyed during the Rev?­o?­lu?­tion.
During the Revolution, the Champmol Charter House was ruined. 
mnli hypothesis: During the Revolution, the Champmol Charter House was ruined.  premise: But the museum's greatest treasures are undoubtedly the dukes' tombs in the Salle des Gardes ' brought here from the Charter?­house of Champmol, which was destroyed during the Rev?­o?­lu?­tion.