The spirit of opposition to the Holy See soon spread from France to the various states of the Holy Roman Empire. The violent onslaughts of the Reformers and the imminent danger of heresy had driven the Catholics of Germany to cling more closely to the Holy See, and had helped to extinguish the anti-Roman feeling, that had been so strong in the early years of the sixteenth century. But once the religious wars had ended without a decisive victory for either party, and once the theory of imperial neutrality had been sanctioned formally by the Peace of Westphalia (1648), the Catholic rulers of Germany, not excluding even the spiritual princes, showed more anxiety to increase their own power than to safeguard the interests of their religion. The example of the Protestant states, where the rulers were supreme in religious as in temporal affairs, could not fail to encourage Catholic sovereigns to assert for themselves greater authority over the Church in their own territories, in utter disregard of the rights of the Pope and of the constitution of the Church. Frequently during the reigns of Leopold I. (1657-1705), of Joseph I. (1705-11), and of Charles VI. (1711-40) the interference of the civil power in ecclesiastical affairs had given just cause for complaint. But it was only during the reign of Francis I. (1745-65), and more especially of Joseph II. (1765-90), that the full results of the Jansenist, Gallican, and Liberal Catholic teaching made themselves felt in the empire as a whole, and in the various states of which the empire was composed. The most learned exponent of Gallican views on the German side of the Rhine was John Nicholas von Hontheim (1701-90), who was himself a student of Van Espen (1646-1728), the well-known Gallican and Jansenist professor of canon law in the University of Louvain. On the return of von Hontheim to his native city of Trier he was entrusted with various important offices by the Prince-bishop of Trier, by whose advice he was appointed assistant-bishop of that See (1740). He was a man of great ability, well versed especially in ecclesiastical and local history, and a close student of the writings of the Gallicans (Richer, Dupin, Thomassin, and Van Espen). At the time the hope of a reunion between the Lutherans and the Catholics in Germany was not abandoned completely. It seemed to von Hontheim that by lessening the power of the Papacy, which was regarded by the Protestants as the greatest obstacle to reconciliation, Gallicanism provided the basis for a good reunion programme, that was likely to be acceptable to moderate men of both parties in Germany. With the object therefore of promoting the cause of reunion he set himself to compose his remarkable book, /De Statu Ecclesiae et de Legitima Potestate Romani Pontificis/, published in 1762 under the assumed name of Justinus Febronius.