Schleswig , historical and cultural region in the southern part of Jutland Peninsula north of the Eider . It includes the northern half of Schleswig-Holstein Country (state) in north Germany and Sønderjylland region in southern Denmark .
Schleswig became a Danish duchy in the 12th century and remained a Denmark associated Fiefs until it after the German-Danish War (1864) from Austria and Prussia forcibly annexed . After the Seven Week War (1866) Schleswig became Holstein incorporated as the only Prussian province. After the First World War the Danish majority living in Nordschleswig (north of Flensburg) agreed with a Referendum (1920) according to the Treaty of Versailles for incorporation in Denmark .
Evidence of combat between Danes and Germans from the 9th to the 12th centuries lies west of the city of Schleswig. Here the Danish kings built an impressive fortification wall, known as Danewerk is known . Nearby are the ruins of Haithabu , a historic Viking trading settlement. There are numerous references to German and Danish cultural influences throughout Schleswig. Scandinavian place names are mixed with German names in the lands north of the Eider, where scattered farms and small hamlets predominate. Danish farms, however, do not extend south of the city of Schleswig. The area from Schleswig north to Flensburg has a mix of saxon and Danish farmhouses, while north of Flensburg the Jutian rectangular closed homestead is most common. The majority of people in the German part of Schleswig speak a Low German dialect while the majority in the Danish part of the region speaks Danish.