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.
After the fall of the French Revolution, Cardinal Louis de Montmorency-Laval (1761-1802) abandoned his position as the last prince bishop. The old diocese was dissolved, and with the Concordat of 1801, a new diocese was formed to cover the departments of Moselle, Ardennes, and Forêts, which later became part of the Archdiocese of Besançon.