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 Newport Treaty of Newport The Treaty of Newport was a failed treaty between Parliament and King Charles I of England, intended to bring an end to the hostilities of the English Civil War. Negotiations were conducted between 15 September 1648 and 27 November 1648, at Newport, Isle of Wight, on the initial proviso that they would not take longer than forty days (negotiations had effectively broken down by 27 October but continued formally to November). Charles was released on parole from his confinement at Carisbrooke Castle and lodged in Newport. Charles began proceedings by withdrawing his declarations against Parliament but also