Monastic Life and Hesychasm
On Athos, Niphon settled near the Great Lavra in the cave associated with the earlier ascetic Peter the Athonite, and placed himself under the spiritual direction of the renowned elder Maximos Kavsokalyvites, with whom he struggled for many years. He is credited by tradition with composing an early account of the life of his elder.
His career also intersected with the doctrinal controversies of the period. By tradition he faced accusations of heresy connected with the Bogomil and Euchite (Messalian) movements, and was defended by figures of the hesychast cause, including Gregory Palamas and Patriarch Callistus I; the anchor record itself preserves only his identity as a priest and hermit of the Holy Mountain.