Amidst the clashing of rival interests which this revolution necessitated, a new principle of unity--that of nationality--arose. This conception, due to an appreciation of the identity of interest based on such things as common language, common religion, natural boundaries, common hopes and fears, was, if a less attractive one than that of the Holy Roman Empire, at least more capable of realisation, and alone seemed able to control the spirit of individualism from running riot. It was in France, Spain, and England that this new spirit of nationality had been most successful: but, if Germany was no more than a loose confederation of princes, the Hapsburgs had already laid the foundation of a monarchy of their own, while the Pope was becoming more and more the prince of a temporal kingdom in Italy. The first result of this triumph of nationality was not surprising. When once a people have realised the identity of their interests, they are apt to be aggressive. This now occurred. England indeed, isolated from the Continent and absorbed in domestic questions, did not take much part as yet; but the others began to look abroad, and Italy, where alone no political unity existed, offered fair hopes of spoil. No sooner had France made the first move in pursuit of her claims on Naples than their cupidity was aroused, and Western Europe was involved in a series of wars which continued, with but little intermission, until the Peace of Vervins, 1598. The circumstances of the age gave to this struggle its peculiar character. National consolidation had been accompanied by the triumph of the monarchical principle, after its long struggle with aristocracy--a struggle which of late had not been confined to the temporal sphere, but had been illustrated also within the Church by the conflict between the Papacy and the General Councils. It followed that the dynastic interests of the reigning families predominated. The monarchs, no doubt, represented the passions and aspirations of their subjects. Nevertheless, their policy was deeply coloured by their personal and family rivalries, and hence the wars were more prolonged than otherwise they might have been. To this also must in part be attributed the shifting combinations of alliances and counter-alliances, which change with the variety and rapidity of a kaleidoscope, and which make the period, so far as its wars are concerned, one of the most confused in history. In the struggle which ensued, the Romance and the Teutonic nations came into close though hostile contact; the theory of the Balance of Power became a guiding principle of politics; and diplomacy found its birth. | Political issues affected by the Reformation. The | beginning of Modern Europe.