text: Feeling that his dominant idea of the Roman universal monarchy was threatened, Leo appealed to the civil power for support, and obtained from Valentinian III the famous decree of June 6, 445, which recognized the primacy of the bishop of Rome based on the merits of Peter, the dignity of the city, and the Nicene Creed (in their interpolated form); ordained that any opposition to his rulings, which were to have the force of law, should be treated as treason; and provided for the forcible extradition by provincial governors of anyone who refused to answer a summons to Rome.