After the French Revolution, the last prince bishop, Cardinal Louis de Montmorency-Laval (1761-1802) fled and the old organization of the diocese was broken up. With the Concordat of 1801 the diocese was re-established covering the departments of Moselle, Ardennes, and Forêts, and was put under the Archdiocese of Besançon.
Following the French Revolution, the last prince bishop, Cardinal Louis de Montmorency-Laval (1761-1802) departed, and the previous diocese organization was dismantled. The Concordat of 1801 led to the re-establishment of a new diocese covering Moselle, Ardennes, and Forêts departments, which later became part of the Archdiocese of Besançon.