The Dukes of Holstein were noble rulers in the region of Holstein, which is located in present-day northern Germany. This title emerged in the late Middle Ages and was associated with the House of Schauenburg. The dukes played a significant role in the political landscape of northern Europe, often engaging in alliances and conflicts with neighboring territories. Throughout their history, the Dukes of Holstein ruled over various territories, including Schleswig and parts of Denmark. Their influence extended into the Holy Roman Empire, and they were involved in the complex feudal system of the time. The dukes' legacy is reflected in the cultural and historical developments of the region.