This is a list of counts and dukes of Rethel. The first counts of Rethel ruled independently, before the county passed first to the Counts of Nevers, then to the Counts of Flanders, and finally to the Dukes of Burgundy. In 1405 the County became part of the Peerage of France, and in 1581 it was elevated to a duchy. In 1663 it became the Duchy of Mazarin.
The county was active in the crusades. King Baldwin II of Jerusalem was the brother of Count Gervais and Countess Matilda of Rethel, while Beatrice of Rethel married King Leo I of Armenia.
Hortense Mancini (1661–1699); the niece of Cardinal Mazarin, Duchesse Mazarin, Duchesse de Mayenne, Duchesse de la Meilleraye, mistress of Charles II of England
Paul-Jules de la Porte (1699–1731; also Duc de la Meilleraye)
Paul de la Porte (1731–1738; also Duc de la Meilleraye)
Louise Jeanne de Durfort (1738–1781; also Duchesse de Mayenne)
By the terms of its entailment, the title became extinct on her death; however, it is still claimed by her descendants, the Sovereign Princes of Monaco.
Bibliography
Alan V. Murray, The crusader Kingdom of Jérusalem, A Dynastic History 1099-1125, Linacre College Oxford, 2000, ISBN 1-900934-03-5