The crown prince having married a niece of the emperor of Germany, and being also of age, his father lost much of his control over him. Frederick was now the rising sun, and his father the setting luminary. All the courts of Europe were anxious to gain the favor of the coming king of Prussia. The king allowed his son a petty income, but the crown prince borrowed large sums of money from the empress of Germany, from Russia, and from England, who were quite ready to supply his wants, being assured of payment when he should receive the throne. Fritz did not forget his sister Wilhelmina, but gave her money to relieve her wants. War now broke out between France and Germany, and Frederick William became an ally of the emperor. The crown prince accompanied the king of Prussia to the siege of Philipsburg. The campaign continued for some time, but the prince saw little of active service. The king of Prussia being broken down in health by gout and intemperance, now became very ill, and was obliged to return home. Though Frederick returned from this campaign neither socially nor morally improved, he had become very ambitious of high intellectual culture and of literary renown. He was now living at the village of Reinsburg, in a castle which the king had purchased and assigned to his son. He here gathered around him a number of scholarly men, and commenced and persevered in a severe course of study, devoting his mornings to his books, and the remainder of the day to recreation and music. The old king grumbled at his son’s studies and his recreations, but Frederick was now a full-grown man, whose heirship to the crown made him a power in Europe; and the snarling old king was confined to his room with dropsy and gout, growling away his last hours. The companions of Frederick’s hours of recreation were gay and profligate young men, who scoffed at religion and every virtue. No wonder that with such godless companions, and with such an inconsistent and irreligious example in his father, even while professing the most fanatical devotion to the church and religion, the mind of the talented young prince should have been turned into the wandering wilds of unbelief. Voltaire was at this time about forty years of age. His renown as a man of genius already filled Europe. Frederick became an ardent admirer of Voltaire, and a correspondence was commenced between them. [Illustration: FREDERICK THE GREAT.]