Anthelm of Belley (1107–1178) was a prior of the Carthusian Grand Chartreuse and bishop of Belley. He was born near Chambéry in 1107. He would later receive an ecclesiastical benefice in the area of Belley. When he was thirty years old, he resigned from this position to become a Carthusian monk at Portes. Only two years after joining the order, he was made the prior of the Grande Chartreuse, the motherhouse of his order, which had recently incurred substantial damage. He was an effective administrator there. While under his direction, the community increased in numbers and fervency. He restored and improved the buildings, including constructing a defensive wall and an aqueduct. The rules of the order were standardized, and changed to allow women the opportunity to enter the order in their own houses. He also brought the other houses of the order into closer alignment with the motherhouse. The monks under his direction included Hugh of Lincoln, who expressed great fondness for Anthelm. Anthelm continued in his office almost constantly for twenty-four years, barring a period of a few years when he was a hermit. After that period, in 1152, Anthelm returned to the Grand Chartreuse, and helped defend the sitting Pope Alexander III against the antipope Victor IV. Alexander III appointed Anthelm bishop of Belley in 1163. In that position, he is said to have been fearless and uncompromising, working to reform the clergy and regulate the affairs of the diocese.