Duke of Schleswig
The following is a list of jarls and dukes, who ruled over Schleswig respectively Southern Jutland (Sønderjylland). == First jarls/dukes == === House of Estridsen (1080–1375) === === House of Schauenburg (1325-1459) === == Under domain of Oldenburg == In 1459, after the annexation of both Schleswig and Holstein, Christian I of Denmark created two separate states: the Duchy of Schleswig and Duchy of Holstein, to be ruled by two different branches of the House of Oldenburg over the next few centuries.