The monks under his direction included Hugh of Lincoln, who expressed great fondness for Anthelm.

After that period, in 1152, Anthelm returned to the Grand Chartreuse, and helped defend the sitting Pope Alexander III against the antipope Victor IV.

In that position, he is said to have been fearless and uncompromising, working to reform the clergy and regulate the affairs of the diocese.

Anthelm, who believed that Humbert was not penitent for his misconduct, withdrew from his diocese in protest.

Anthelm returned to Belley to help care for the poor and the lepers of the area.