Encounter with Mary of Egypt
While keeping the Lenten retreat in the desert, Zosimas is said to have met a solitary ascetic woman who related to him the story of her former life and long penitence; she is identified in the tradition as Mary of Egypt. She asked him to come the following year to the bank of the Jordan on Holy Thursday and to bring her Holy Communion, which he did.
Returning afterward to seek her again in the wilderness, Zosimas found that she had reposed, and he buried her. This episode is the reason for his commemoration: he is remembered as the elder who communed Mary of Egypt and gave her burial, and through whom her life became known. The sources connect the encounter to the reign of the emperor Justinian I (527–565).