E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Three Bishoprics (The).
So the French call the three cities of Lorraine, Metz, and Verdun, each of which was at one time under the lordship of a bishop. They were united to the kingdom of France by Henri II. in 1552. Since the Franco-German war they have been attached to Germany.