The Three Bishoprics constituted a government of the Kingdom of France consisting of the dioceses of Metz, Verdun, and Toul within the Lorraine region. The three dioceses had been Prince-bishoprics of the Holy Roman Empire until they were seized by King Henry II of France between April and June 1552. At the end of the Thirty Years' War, they were officially ceded to France by the 1648 Peace of Westphalia.

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.