The Duke of Habsburg refers to a title held by members of the House of Habsburg, a prominent European royal family. This dynasty played a significant role in European history, particularly during the late Middle Ages and the Renaissance. The Habsburgs were known for their extensive territorial holdings, which included parts of modern-day Austria, Switzerland, and Hungary. The title of Duke was often granted to members of the family to signify their noble status and territorial control. The Habsburgs produced many influential rulers, including Emperor Ferdinand I and Empress Maria Theresa, who shaped the political landscape of Europe through strategic marriages and alliances.