The Duke of Rethel was a noble title in the historical region of Rethel, located in present-day France. This title was part of the larger feudal system in medieval Europe, where dukes held significant power and land. The title was often associated with the House of Rethel, which played a role in the political landscape of the time. The title of Duke of Rethel was created in the 12th century and was held by various noble families. It became less prominent over time, especially after the French Revolution, which led to the decline of many noble titles in France. The legacy of the Duke of Rethel remains a part of the region's rich history.