Question: when did the time of the roman empire begin
[{'answer': '27 BC', 'provenance': [{'wikipedia_id': '25507', 'title': 'Roman Empire', 'start_paragraph_id': 1, 'start_character': 401, 'end_paragraph_id': 1, 'end_character': 406, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25507', 'title': 'Roman Empire', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 1656, 'bleu_score': 0.7336197628078981, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6409960519272935743}, 'section': 'Section::::History.\n'}]}]