Jutland peninsula is made up of the German Bundesland of Schleswig-Holstein. Schleswig-Holstein has two parts: the former duchies of Schleswig (Danish fief) and Holstein (German fief), both of which have passed back and forth between Danish and German rulers several times. The last adjustment of the Danish–German border followed the Schleswig Plebiscites in 1920 and resulted in Denmark's regaining Northern Schleswig ( or more commonly today: "Sønderjylland"). The historical southern border of Jutland are areas south of Kiel, Husum and Rendsburg, but the river Eider was the border between the former duchies of Schleswig and Holstein, as well as the historical
Jutland in c. 450 AD. The Angles themselves gave their name to the new emerging kingdoms called England (i.e., "Angle-land"). Saxons and Frisii migrated to the region in the early part of the Christian era. To protect themselves from invasion by the Christian Frankish emperors, the Danes built the Danevirke, a wall stretching across South Jutland from the North Sea to the Baltic Sea, beginning in the 8th century. The pagan Saxons inhabited the southernmost part of the peninsula at the Baltic Sea until the Saxon Wars in 772-804 AD in the Nordic Iron Age, when Charlemagne violently subdued them and