After the death of Charles VII., Francis, grand duke of Tuscany, Maria Theresa's husband, was elected emperor. Francis I. (1745-1765), an amiable nonentity, with the instincts of a shopkeeper, made no pretence of discharging important imperial duties, and the task of ruling the hereditary possessions of the house of Habsburg fell wholly to the empress-queen. She executed it with discretion and vigour, so that Austria in her hands was known to be one of the most formidable powers in the world. Her rival, Frederick II., was, if possible, still more active. It did not occur to him, any more than to the other German sovereigns of the 18th century, to associate his people with him in the government of the country; he was in every respect a thoroughly absolute sovereign. But he shared the highest ideas of the age respecting the responsibilities of a king, and throughout his long reign acted in the main faithfully as "the first servant of the state." The army he always kept in readiness for war; but he also encouraged peaceful arts, and diffused throughout his kingdom so much of his own alert and aggressive spirit that the Prussians became more intelligent and more wealthy than they had ever before been. He excited the admiration of the youth of Germany, and it was soon the fashion among the petty princes to imitate his methods of government. As a rule, they succeeded only in raising far larger armies than the taxpayers could afford to maintain. The Seven Years' War, 1756-1763. Maria Theresa never gave up the hope of winning back Silesia, and, in order to secure this object, she laid aside the jealousies of her house, and offered to conclude an alliance with France. Frederick had excited the envy of surrounding sovereigns, and had embittered them against him by stinging sarcasms. Not only France, therefore, but Russia, Saxony and ultimately Sweden, willingly came to terms with Austria, and the aim of their union was nothing short of the partition of Prussia. Frederick, gaining knowledge of the plot, turned to England, which had in the previous war helped Austria. At the close of 1755 his offer of an alliance was acceded to; and in the following year, hoping by vigorously taking the initiative to prevent his enemies from united action, he invaded Saxony, and began the Seven Years' War (q.v.), the result of which was to confirm Prussia in the possession of Silesia.