On 2 August 1898 in
Coburg,
Saxe-Coburg and Gotha, he married
Princess Dorothea of Saxe-Coburg and Gotha, daughter of
Prince Philipp of Saxe-Coburg and Gotha and
Princess Louise of Belgium. The grandfather of the bride, King
Leopold II, did not attend the wedding but sent the Grand Cordon of the Order of Leopold as wedding gift. The couple had no children. However, on 11 November 1920, Ernst Gunther adopted Prince Johann Georg (24 July 1911 – killed in Russia 23 June 1941) and his sister Princess Marie Luise (1908–1969, married 1st 1934 and div 1955 Rudolf Karl Freiherr von Stengel and married 2nd 1962 Friedrich Christian Prince
zu Schaumburg-Lippe), children of his cousin Prince Albrecht of Schleswig-Holstein-Sonderburg-Glücksburg (1863–1948). ==Honours==