Upon graduating from Athens University in 1978, Petros was ordained as a priest by Bishop Chrysostomos of Dodonis and left for Cairo, where he was given the title of Patriarchal Vicar.[5] Later, in 1983, Petros was promoted to Bishop of Babylon.[2] Throughout his career, Petros took on multiple posts throughout Africa, ranging from Johannesburg, Accra, Cameroon and Central East Africa.[3] While in Africa, Petros focused on restoring monasteries, such as the Monastery of St. Sawas in Alexandria, and extending his missionary work in East Africa.[4]