What sovereign duke of the Duchy of Saxe-Coburg and Gotha, composed the opera Diana von Solange in 1858?
Ernest II, Duke of Saxe-Coburg and Gotha Ernest II (German: "Ernst August Karl Johann Leopold Alexander Eduard"; 21 June 1818 – 22 August 1893) was the sovereign duke of the Duchy of Saxe-Coburg and Gotha, reigning from 1844 to his death. Ernest was born in Coburg as the eldest child of Ernest I, Duke of Saxe-Coburg-Saalfeld, and his duchess, Princess Louise of Saxe-Gotha-Altenburg. Fourteen months later, his younger brother Prince Albert was born, who became consort of Queen Victoria of the United Kingdom. Ernest's father became Duke of Saxe-Coburg and Gotha in 1826 through an exchange of territories.
Charles Theodore, Elector of Bavaria Charles Theodore (German: "Karl Theodor" ; 11 December 1724 – 16 February 1799) reigned as Prince-elector and Count Palatine from 1742, as Duke of Jülich and Berg from 1742 and also as prince-elector and Duke of Bavaria from 1777 to his death. He was a member of the House of Palatinate-Sulzbach, a branch of the House of Wittelsbach.