The Prince-Bishopric of Verdun was a state of the Holy Roman Empire. It was located at the western edge of the Empire and was bordered by France, the Duchy of Luxembourg, and the Duchy of Bar. Some time in the late 990s, the suzerainty of the County of Verdun passed from Herman of Ename of the House of Ardenne–Verdun to the Bishopric of Verdun.

The Peace of Westphalia is the collective name for two peace treaties signed in October 1648 in the Westphalian cities of Osnabrück and Münster. They ended the Thirty Years' War (1618–1648) and brought peace to the Holy Roman Empire, closing a calamitous period of European history that killed approximately eight million people. Holy Roman Emperor Ferdinand III, the kingdoms of France and Sweden, and their respective allies among the princes of the Holy Roman Empire, participated in the treaties.