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.
Countess Caroline of Erbach-Fürstenau Countess Caroline Amalie of Erbach-Fürstenau (born: 29 September 1700 at Fürstenau Castle, Michelstadt – died: 7 May 1758 in Hildburghausen), was a countess of Erbach-Furstenau and by marriage Duchess of Saxe-Hildburghausen. From 1745 to 1748, she was also Regent of Saxe-Hildburghausen.