Please answer a question about the following article about Seven Years%27 War:

The war was successful for Great Britain, which gained the bulk of New France in North America, Spanish Florida, some individual Caribbean islands in the West Indies, the colony of Senegal on the West African coast, and superiority over the French trading outposts on the Indian subcontinent. The Native American tribes were excluded from the settlement; a subsequent conflict, known as Pontiac's War, was also unsuccessful in returning them to their pre-war status. In Europe, the war began disastrously for Prussia, but a combination of good luck and successful strategy saw King Frederick the Great manage to retrieve the Prussian position and retain the status quo ante bellum. Prussia emerged as a new European great power. The involvement of Portugal, Spain and Sweden did not return them to their former status as great powers. France was deprived of many of its colonies and had saddled itself with heavy war debts that its inefficient financial system could barely handle. Spain lost Florida but gained French Louisiana and regained control of its colonies, e.g., Cuba and the Philippines, which had been captured by the British during the war. France and other European powers will soon avenge their defeat in 1778 when American Revolutionary War broke out, with hopes of destroying Britain's dominance once and for all.

Who was the leader of Prussia?
King Frederick the Great