Question: who served as the first emperor of the roman empire
[{'answer': 'Augustus', 'provenance': [{'wikipedia_id': '25791', 'title': 'List of Roman emperors', 'start_paragraph_id': 1, 'start_character': 160, 'end_paragraph_id': 1, 'end_character': 168, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]