Early Life and Education
Sources place John's birth in 1651 at Nizhyn (Nezhin), then within the Cossack Hetmanate. He belonged to a noble Cossack family and is described as the only one of seven sons to give himself to the service of the Church. He studied at the Kiev Academy (the Kiev-Mohyla Collegium), from which he graduated, and remained there for a time as a teacher of poetics, rhetoric, and Latin.
He was tonsured a monk at the Kiev Caves Lavra and was noted for his preaching and learning. Accounts differ in detail — some place his tonsure in 1676 and others in 1680 — but they agree that the Lavra was the setting of his monastic profession.