There, Zeno became Peter's spiritual guide and Peter became acquainted with the monastic circles in the region. According to his biographer, John Rufus, Peter refused to write to or receive letters from home lest it undermine his ascetic discipline. At some point around 445, the bishop of Maiuma ordained Peter though Peter attempted to avoid serving as a priest in favour of monastic life.

In 452, he was consecrated bishop of Maiuma by Patriarch Theodosius.