South Jutland County effect. South Jutland county is also known as Northern Schleswig (Danish: "Nordslesvig", German: "Nordschleswig"). The name refers specifically to the southernmost 50 kilometers of the Danish part of the Jutland Peninsula that formerly belonged to the former Duchy of Schleswig (Danish: "Slesvig" or "Sønderjylland"); a Danish fief under the Kings of Denmark. Denmark lost the Duchy of Schleswig, as well as the German Duchies of Holstein and Lauenburg, to Prussia and Austria in 1864 in the Second War of Schleswig. Following Austria's defeat in the Austro-Prussian War (1866), all three provinces were annexed to Prussia. Following the defeat of Germany
Jutland border between the Danish and German realms from c. 850 to 1864. Although most of Schleswig-Holstein is geographically part of the Jutland peninsula, most German residents there would not identify themselves with Jutland or even as "Jutlanders", but rather with "North Germany" () and Schleswig-Holstein, considering themselves "Northern Germans" () and "Schleswig-Holsteiner". The medieval law Code of Jutland applied to Schleswig until 1900 when it was replaced by the Prussian Civil Code. Some rarely used clauses of the Jutlandic Code still apply north of the Eider, even some cities south of the river- all of Rendsburg and more than half