Monastic Career
Theodosius's formation took place in the heart of Kyivan monasticism. After his tonsure at the Kiev Caves Lavra and ordination at the Krupitsky Monastery, he served as prior of the Korsun Monastery from 1662. In 1664 he was placed at the head of the Kiev-Vydubitsky Monastery, an ancient community that had fallen into ruin, and restored it. In 1688 he was elevated to Archimandrite of the Eletsy Monastery in Chernigov, positioning him for his eventual elevation to the episcopate of that city.