Education and Monastic Beginnings
The synaxarion presents Hierotheus as a man of unusual learning who mastered Latin, Greek, and philosophy before renouncing the world. One account adds that he studied philosophy at Constantinople under a teacher named Giakoumis and traveled to Venice for further study, combining the intellectual culture of his age with the ascetic tradition of the Holy Mountain.
His monastic formation on Athos proceeded in stages: he first attached himself to a hermit near the cell of Saint Artemios, then entered the cenobitic life at Iviron and received the tonsure there. After completing his studies in Venice he returned to Athos and took up the solitary life in the Khaga wilderness near the monastery, where he gave himself to the constant invocation of the name of Jesus.