Westphalia to be Catholic. Osnabrück was divided almost equally between Catholicism and Protestantism. Parts of Westphalia came under Brandenburg-Prussian control during the 17th and 18th centuries, but most of it remained divided by duchies and other areas of feudal power. The Peace of Westphalia of 1648, signed in Münster and Osnabrück, ended the Thirty Years' War. The concept of nation-state sovereignty resulting from the treaty became known as "Westphalian sovereignty". After the defeat of the Prussian Army by the French at the Battle of Jena–Auerstedt, the Treaty of Tilsit in 1807 made the easternmost portion of today's Westphalia part of the
Portuguese Restoration War at the negotiations for the European settlement-of-settlements, the new "realpolitik" of the peace of Westphalia (1648). With this treaty and the end of hostilities in Catalonia in 1652, Spain was again ready to direct its efforts against Portugal, but it faced a lack of men, resources, and, especially, good military commanders. By 1662, Spain had committed itself to a major effort to end the war. John of Austria the Younger, Philip IV's illegitimate son, led 14,000 men into Alentejo, and, the following year, they succeeded in taking Évora, the major city of the region. The Portuguese, under António Luís de