Question: What was the title of the father of this sovereign duke of the Duchy of Saxe-Coburg and Gotha who composed the opera "Diana von Solange"?
Sentence (from "Friedrich Josias, Prince of Saxe-Coburg and Gotha"): Friedrich Josias, Prince of Saxe-Coburg and Gotha (Friedrich Josias Carl Eduard Ernst Kyrill Harald; Callenberg Castle, 29 November 1918 – Amstetten, Austria, 23 January 1998) was the head of the Ducal Family of Saxe-Coburg and Gotha and titular Duke of Saxe-Coburg and Gotha from 1954 until his death.
Relevant evidence: No