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.
Archduchess Karoline Marie of Austria Archduchess Karoline Marie of Austria (German: "Carolina Maria Immakulata Josepha Ferdinanda Therese Leopoldine Antoinette Franziska Isabella Luise Januaria Christine Benedikta Laurencia Justiniana, Erzherzogin von Österreich, Prinzessin von Toskana" ) (5 September 1869, Altmünster, Upper Austria, Austria–Hungary – 12 May 1945, Budapest, Hungary) was a member of the House of Habsburg-Tuscany and Archduchess of Austria, Princess of Tuscany by birth. Through her marriage to Prince August Leopold of Saxe-Coburg and Gotha, Karoline was also a member of the Koháry branch of the House of Saxe-Coburg and Gotha. Karoline was the fourth child and second eldest daughter of Archduke Karl Salvator of Austria and his wife Princess Maria Immaculata of Bourbon-Two Sicilies. She was Princess-Abbess of the Theresian Royal and Imperial Ladies Chapter of the Castle of Prague (1893-1894).