But once the religious unity of Europe was broken by the separation of entire nations from the Church, and once the politico-religious constitution of the Holy Roman Empire was destroyed by the acceptance of the principle of religious neutrality, the Popes felt that their interference even indirectly in temporal matters, however justifiable it might be in itself, could produce no good results. Hence apart from their action as temporal sovereigns of the Papal States, a position that obliged the Popes to take part in political affairs, the whole tendency was to confine themselves strictly to spiritual matters, and to preserve harmony if possible between Church and State. This policy did not, however, satisfy the selfish designs of rulers, who had determined to crush all representative institutions and to assert for themselves complete and unlimited authority. Catholic rulers, jealous of the increased powers secured by Protestant princes through the exercise of supreme ecclesiastical jurisdiction, determined to assert for themselves a somewhat similar authority over the Catholic Church in their own territories. It was no longer the supposed inroads of the Church upon the domain of the State but the attacks of the State upon the rights of the Church, that were likely to disturb the good relations between Catholic princes and the Pope. These rulers demanded an overwhelming voice in all ecclesiastical appointments; they insisted upon exercising the /Royal Placet/ upon papal documents and episcopal pronouncements; they would tolerate no longer the privileges and exemptions admitted by their predecessors in favour of clerics or of ecclesiastical property; they claimed the right of dictating to the cardinals who should be Pope and of dictating to the Pope who should be cardinals; of controlling education in their own dominions; of determining the laws and rules concerning marriages and matrimonial dispensations, and of fixing the constitutions of those religious orders the existence of which they were willing to tolerate.