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
Treaty of Turin (1696) The war was formally ended by the 1697 Treaty of Ryswick which incorporated the Treaty of Turin. By splitting the Allies, Savoy's defection enabled Louis to obtain better terms at Ryswick than he might otherwise have done, for a relatively minor cost. France relinquished Pinerolo but Savoy's territories in Transalpine France were almost impossible to defend and were occupied by France again from 1704 to 1714. Victor Amadeus achieved his primary goals of recovering Pinerolo and Casale, while his daughter's marriage enhanced Savoy's position on the European stage. The cost was a devastated and impoverished country and "...a reputation for...cynical