Artaldus was a 13th-century Carthusian monk and the Bishop of Belley. Born in 1101 at the castle of Sothonod in Savoy, he initially served in the court of Duke Amadeus III before pursuing a religious life. After being ordained a priest, he helped establish the Arvières Charterhouse in 1132. Although he was appointed to lead the See of Belley in his eighties, he resigned shortly after to return to his monastic community, where he lived until his death in 1206.