The article contains comparative analysis of encyclicals of the Popes: Gregory XVI, Pius IX, Leon XIII, Pius XI, John Paul II and Augustins workCity of God.State in the Christian space are being found in the focus of attention of this article. It is commanding, thatCity of GodAugustine is a foundation for encyclicals.

Keywords:St. Augustine, theory of the state, Vatikan’s teaching about the state.