Gerasimos of Euboea was born in the city of Chalkida on the island of Euboea, into a noble family, and may have belonged to the royal family of Fatsos. Leaving behind his wealth, he withdrew to Sinai, where he became a disciple of Venerable Gregory of Sinai. Together with him he went to Greece and lived in ascetic struggle on the Holy Mountain. Patriarch Kallistos I writes about the virtues and ascetic labours of Venerable Gerasimos, who imitated Venerable Gerasimos of the Jordan.
Venerable Gerasimos gathered a monastic community and established several hesychasteria, where the monks practised stillness and noetic prayer. His disciple was the future Patriarch of Constantinople, Isidore Boucheir. A friend of Venerable Gerasimos was his fellow countryman, Venerable Joseph of Euboea.
Information about Venerable Gerasimos is contained in the Life of Venerable Gregory of Sinai, written by Patriarch Kallistos I.
