This belief may have its origins in the accusations of Jonas of Orléans, who claimed Claudius was a disciple of Felix of Urgel.
[7] Claudius was a member of an elite circle of secular and ecclesiastic politicians and authorities and a creatura della corte di Aquisgrana ("creature of the court of Aachen").
[3] It has been suggested that the appointment of a theologian and scholar to a post such as Turin, which had attendant military duties due to the threat of Saracen raids, was largely based on the need for an imperial supporter in Italy in light of the rebellion of Bernard.
[9][10] As bishop of Turin, Claudius found that men were often directed to go on pilgrimage to Rome for penance and that worshippers were accustomed to venerate Christ and the saints by bowing before images and relics.
[11] He made attacks on the use of images, relics, and crosses, he opposed pilgrimages to obtain absolution, and he had little regard for the authority of the pope due to his belief that all bishops were equal.
[3] Claudius was a heretic in the view of Dungal and Jonas of Orléans, who later wrote to refute some of his teachings at the request of the emperor.
[1] He was dead by the time Dungal finished his Responsa contra peruersas Claudii Taurinensis episcopi sententias late in 827, so it can be presumed that he died that year.
[1] This commentary was edited by Johann Alexander Brassicanus in Vienna before it was first printed in Basel by Hieronymus Froben in 1531.
His epistles on 1 and 2 Corinthians, however, dedicated to Theodemir, abbot of Psalmody, and a possible student of his, were sent to Aachen by the dedicatee to be condemned by the assembled bishops of the realm.
[15] The imperial court would have been familiar with the work because Claudius later wrote that it had been well-received despite the attempts of his former friend, Theodemir of Nismes, to have it condemned as heretical.
He saw the veneration of saints and claimed images as Pelagian, he argued that people need to only worship the creator and not the creation.