 The dukes of Schleswig also became kings of Denmark.With the demise of the Holy Roman Empire in the 19th century, the term "Sønderjylland" was revived by Denmark and became the subject of a naming dispute between Danes and Germans (the latter continuing the centuries-old "Schleswig") - part of the struggle over possession of the territory itself, which came to war in 1848 and again in 1864.Following the Schleswig Plebiscites in 1920, South Jutland was divided into Northern and Southern Schleswig.