War of the Reunions well as the Treaty of Westphalia of 1648 (which ended the Thirty Years War), ceded a number of towns to France. By tradition, when a town changed hands, so did the surrounding rural areas, which provided it with food and other such supplies. Often, the borders of these dependent regions were ill-defined. Thus, Louis and his court, from 1670, introduced several Chambers of Reunion to investigate whether France had been granted all the territory that it had been owed. The Chambers of Reunion, loyal to the king, ruled, after a review of conflicting medieval documents, that a number of outlying
Treaty of Xanten in Westphalia to be governed by the House of Hohenzollern, and were the oldest constituents of the future Prussian Rhineland and the future Province of Westphalia. Treaty of Xanten The Treaty of Xanten () was signed in the Lower Rhine town of Xanten on November 12, 1614 between Wolfgang Wilhelm, Count Palatine of Neuburg and John Sigismund, Elector of Brandenburg, with representatives from England and France serving as mediators. The treaty ended the War of the Jülich Succession and all hostilities between Wolfgang William and John Sigismund. Based on the terms of the treaty, the territories of Jülich-Berg and Ravenstein