He even produced several forged documents—the famous "Le Mans forgeries"—to support his claim to oversight of the abbey.
[1] The monks had had their privilege of episcopal immunity and right of free election of their abbot confirmed at the council of Bonneuil in 855 and again in 862 at Pîtres.
[3] King Charles the Bald ruled in the Saint-Calais's favour at a synod in the palace of Verberie on 25 October 863.
[1][4] In 864 Charles sent Robert to Rome with Rothad, the deposed bishop of Soissons, to argue his case before Pope Nicholas.
[4][6] In 873 Robert requested Charles to approve the surrender of some precaria to the monastery of Saint-Vincent du Mans, which was under episcopal control at the time.