The Duke of Navarre is a historical title associated with the region of Navarre, located in northern Spain. The title became prominent in the late Middle Ages and was held by various noble families. The most notable Duke of Navarre was Henry IV of France, who was originally Henry III of Navarre before ascending to the French throne in the late 16th century. The title has connections to the broader context of the French Wars of Religion, where the Duke played a significant role in the conflicts between Catholics and Protestants. The title has since become less prominent, but it remains a symbol of the rich history of the region and its influence on European politics.