How did the Peace of Vienna change control of Schleswig and Holstein?

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The Peace of Vienna, signed on October 30, 1864, concluded the German-Danish War by requiring the Danish king, Christian IX, to cede the duchies of Schleswig and Holstein to Austria and Prussia jointly.123

This treaty effectively ended Danish control over the territories, establishing them as the joint possession of the two victorious powers. This arrangement was later modified by the Convention of Gastein in 1865, which assigned the administration of Schleswig to Prussia and Holstein to Austria, before the duchies were ultimately annexed by Prussia following the Seven Weeks’ War in 1866.132