North Rhine-Westphalia | Westphalia | Treaty of Versailles | Treaty of Trianon | Peace of Westphalia | Treaty of Utrecht | Treaty of Aix-la-Chapelle | Steinhagen, North Rhine-Westphalia | Kingdom of Westphalia | Werther, North Rhine-Westphalia | Treaty of Berlin (1878) | Province of Westphalia | Blankenheim, North Rhine-Westphalia | Treaty of Rome | Treaty of Lisbon | Treaty of Campo Formio | Treaty of Berlin | Treaty of Aix-la-Chapelle (1748) | Maastricht Treaty | Treaty of the Pyrenees | Treaty of Saint-Germain-en-Laye (1919) | Treaty of Guadalupe Hidalgo | Penn Treaty Park | Lengerich, Westphalia | Lateran Treaty | Bergheim, North Rhine-Westphalia | Washington Naval Treaty | Treaty of San Stefano | Treaty of Roskilde | Treaty of Nice |
At the Treaty of Westphalia, his envoy Joachim Friedrich von Blumenthal negotiated the acquisition of several important territories such as Halberstadt.
His historical works on the Thirty Years' War and on the Treaty of Westphalia have been regarded as among the best historical books written by Jesuits.