Monastic Life and Foundation
Athanasius was a disciple of Saint Alexander of Svir (1448–1533), the founder of the Trinity Monastery in the Novgorod lands. As a disciple, he would have entered monastic life under Alexander before the latter's death in 1533.
After his teacher's repose, Athanasius withdrew into the forests of Karelia, near the city of Olonets, and established the Dormition hermitage on an island of Lake Syandem. According to the synaxarion, the criticism and hostility of the local inhabitants prompted him to return to the Svir monastery, where he became abbot (igumen). He later went back to his hermitage in the woods, where he reposed in about the year 1550 at a great age.