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"?
{'answer': 'Duke of Saxe-Coburg-Saalfeld', 'supporting_facts': [['Diana von Solange', 0], ['Ernest II, Duke of Saxe-Coburg and Gotha', 0], ['Ernest II, Duke of Saxe-Coburg and Gotha', 1]]}