シュレースヴィヒ＝ホルシュタイン問題
The Schleswig-Holstein Question (; ) was a complex set of diplomatic and other issues arising in the 19th century from the relations of two duchies, Schleswig () and Holstein (), to the Danish crown, to the German Confederation, and to each other. The British statesman Lord Palmerston is reported to have said: "Only three people have ever really understood the Schleswig-Holstein businessthe Prince Consort, who is deada German professor, who has gone madand I, who have forgotten all about it."