St. Nikodemos the Hagiorite (1749–July 14, 1809) was a Greek Orthodox monk, preacher, and theologian, celebrated for his revival of traditional Christian practices and his profound influence on Eastern Orthodox spirituality. Born Nicholas Kallivourtzis on the island of Naxos, Greece, to pious parents, Anthony and Anastasia (who later became a nun named Agathi), he displayed early intellectual gifts and piety. Educated initially by his parish priest, he studied theology and languages at the Evangelical School in Smyrna (modern Izmir, Turkey) under Archimandrite Chrysanthos, brother of St. Cosmas Aitolos. At 26, in 1775, he joined the monastic community on Mount Athos, entering Dionysiou Monastery, where he was tonsured and renamed Nikodemos. Nikodemos’s preaching and writing focused on renewing Orthodox faith during Ottoman rule, emphasizing hesychasm—a contemplative prayer method involving the Jesus Prayer—and the centrality of Scripture and patristic wisdom. Ordained a hieromonk, he served as a preacher through his extensive literary output rather than a traditional pulpit, though he guided many through spiritual counsel. His most famous works include The Philokalia, co-edited with St. Macarius of Corinth, an anthology of monastic writings that revitalized hesychasm, and The Rudder (Pedalion), a canonical guide co-authored with Hieromonk Agapios. Other notable books, like Handbook of Spiritual Counsel and The Evergetinos, reflect his ascetic zeal and pastoral heart. A key figure in the Kollyvades movement, he advocated frequent Communion and traditional practices, often living in solitude on Mount Athos, including at Pantokrator Skete and Skyropoula island.