The title "Duchess of Schleswig" refers to a noble title associated with the historical region of Schleswig, located in present-day Denmark and Germany. The duchy has a rich history, often linked to various royal families in Northern Europe, particularly during the Middle Ages. The title has been held by several women, often through marriage, and has played a role in the political alliances of the time. The duchy itself was part of the larger Duchy of Slesvig and has seen numerous territorial changes throughout history. It was involved in conflicts such as the Second Schleswig War in the 19th century, which shaped the modern borders of Denmark and Germany. The title remains a symbol of the region's noble heritage.