Example image of eyePlorer eyePlorer map for 'Duchy of Schleswig': Denmark Germany Low German North Frisian language Slesvig English language Atlantic Ocean Baltic Sea Kiel Canal North Sea Rhine Russia Angles Eider (river) Jutes Saxons Early Middle Ages Lands of Denmark Danevirke Hedeby National Museum of Denmark Holy Roman Empire Otto II, Holy Roman Emperor Sweyn Forkbeard Cnut the Great Conrad II, Holy Roman Emperor Canute Lavard Duke Earl Eric I of Denmark Niels of Denmark Abel of Denmark Valdemar II of Denmark Holstein-Glückstadt Fiefdom Nation state Romantic nationalism List of Danish monarchs Holstein Schleswig-Holstein Question Austrian Empire First Schleswig War Kingdom of Prussia Otto von Bismarck Russian Empire German Confederation Second Schleswig War Gastein Convention Austro-Prussian War Province of Schleswig-Holstein