Peter was born in Halych-Volynia of pious parents, Theodore and Eupraxia. At the age of twelve, Peter entered a monastery. He successfully studied the book sciences of those times and eagerly fulfilled his monastic obedience. Because of his virtuous and ascetic life, the igumen of the monastery had St Peter ordained as a hieromonk. After years of ascetic labors at the monastery, the Hieromonk Peter, with the blessing of the igumen, left the monastery in search of a solitary place.