The Duchy of Swabia was a historical region in what is now southwestern Germany. Established in the early Middle Ages, it became a significant political entity within the Holy Roman Empire. The duchy was known for its influential rulers and played a crucial role in the development of German territories. Swabia's borders varied over time, but it generally included parts of modern-day Baden-Württemberg and Bavaria. The duchy was characterized by its rich culture, economy, and strategic importance, especially during the Ottonian and Salian dynasties. It eventually declined in power and was absorbed into other territories by the late Middle Ages.