Arms of the Dukes of Mercœur of the House of Lorraine The Seigneurs and Dukes of Mercœur were a line of powerful lords deriving their name from the estate of Mercœur in Auvergne , France. The line became extinct in the 14th century, and passed by inheritance to the dauphins of Auvergne, counts of Clermont . In 1426 it passed to the Bourbons by the marriage, of Jeanne de Clermont , dauphine of Auvergne, to Louis I, Count of Montpensier . It formed part of the confiscated estates of the Constable de Bourbon , and was given by Francis I and Louise of Savoy to Antoine, Duke of Lorraine , and his wife, Renée of Bourbon , sister of the Constable. Nicholas of Lorraine , son of Duke Antoine, was created Duke of Mercœur and a peer of France in 1569. His son Philippe Emmanuel left a daughter, who married the duc de Vendôme in 1609.[ 1]
House of Lorraine
The title became extinct in 1712.
Other creations
The title was re-created in 1723 for Louis François I de Bourbon, prince de Conti , who sold it back to the crown in 1770.
In 1773, it was re-created for Charles, Count of Artois , but was exchanged in 1778 for Poitou .
Notes
References
Pre-1789 French Peerage St François de Sales, Oraison funèbre de Philippe-Emmanuel de Lorraine, duc de Mercœur et de Penthièvre. Introduction de Pierre-Olivier Combelles. Editions Saint-Rémi (Cadillac). 93 p., ill. 
