The Duke of Zähringen was a title held by the rulers of the Zähringen dynasty, which emerged in the 11th century in what is now southwestern Germany. This noble family played a significant role in the development of the region, particularly in areas like Baden and Fribourg. The dukes were known for their efforts in expanding their territories and establishing cities. The Zähringen dynasty is notable for founding several important towns, including Bern and Freiburg im Breisgau. Their influence helped shape the political landscape of medieval Germany. The title of Duke of Zähringen eventually became extinct in the late 13th century, but their legacy remains in the cities and institutions they established.