From when was the father of Ernst Gunther pretender to the throne of Schleswig-Holstein?
Ernst Gunther, Duke of Schleswig-Holstein: Ernst Gunther, Duke of Schleswig-Holstein (August 11, 1863 – February 22, 1921) was a son of Frederick VIII, Duke of Schleswig-Holstein and Princess Adelheid of Hohenlohe-Langenburg. Frederick VIII, Duke of Schleswig-Holstein: Duke Frederick VIII (Danish: "Frederik Christian August af Slesvig-Holsten-Sønderborg-Augustenborg" ; German: "Friedrich Herzog von Schleswig-Holstein-Sonderburg-Augustenburg" ) (July 6, 1829 – January 14, 1880) was the German pretender to the throne of Schleswig-Holstein from 1863, although in reality Prussia took overlordship and real administrative power.
1863