You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "What sovereign duke of the Duchy of Saxe-Coburg and Gotha, composed the opera Diana von Solange in 1858?" whose answer is Ernest II.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Duchy of Saxe-Coburg and Gotha operas 1858
Useful Output:

Doc 1: Diana von Solange is an opera by the German prince Ernst II of Saxe-Coburg-Gotha, an amateur composer. It was premiered in 1858. In 1859, Franz Liszt wrote
Doc 2: Alfred, Duke of Saxe-Coburg and Gotha was born on 6th August 1844 in Windsor Castle. The long-awaited second son, he was nicknamed Alfie by
Doc 3: In 1858 he attended the premiere of Ernest's opera Diana von Solange. The following year he saw the same work in Gotha. He witnessed Ernest
Doc 4: On November 9, 1918, after the German Empire lost World War I, the Workers' and Soldiers Council of Gotha, deposed the last Duke of Saxe-Coburg
Doc 5: The life of Prince Alfred, Duke of Edinburgh and Saxe-Coburg and Gotha  In August 1858, he passed his naval entrance examination and