Question: who plays the king of hanover in victoria
[{'answer': 'Peter Firth', 'provenance': [{'wikipedia_id': '48470912', 'title': 'Victoria (British TV series)', 'start_paragraph_id': 20, 'start_character': 12, 'end_paragraph_id': 20, 'end_character': 23, 'bleu_score': 1.0, 'section': 'Section::::Cast.:Main.\n'}]}]