Pope Leo the Great defined the role of the state as being a defender of the church's cause and a suppressor of heresies in a letter to the Eastern Roman Emperor Leo I: "You ought unhesitatingly to recognize that the Royal Power has been conferred to you not only for the Rule of the world, but especially for the defense of the Church, so that by suppressing the heinous undertakings you may defend those Statutes which are good and restore True Peace to those things which have been disordered".