Question: a political leader during the roman empire was called
[{'answer': 'emperors', 'provenance': [{'wikipedia_id': '25507', 'title': 'Roman Empire', 'start_paragraph_id': 1, 'start_character': 208, 'end_paragraph_id': 1, 'end_character': 216, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25507', 'title': 'Roman Empire', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17628917190152466968}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '25507', 'title': 'Roman Empire', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['The Roman Empire was then ruled by multiple emperors and divided in a Western Roman Empire, based in Milan and later Ravenna, and an Eastern Roman Empire, based in Nicomedia and later Constantinople.', 'The Roman Empire (, ; Koine Greek: , tr. ) was the post-Republican period of ancient Rome, consisting of large territorial holdings around the Mediterranean sea in Europe, North Africa and West Asia ruled by emperors', 'The Roman Empire (, ; Koine Greek: , tr. ) was the post-Republican period of ancient Rome, consisting of large territorial holdings around the Mediterranean sea in Europe, North Africa and West Asia ruled by emperors.']}}]}, {'provenance': [{'wikipedia_id': '25507', 'title': 'Roman Empire', 'section': 'Section::::Religion.\n', 'start_paragraph_id': 249, 'end_paragraph_id': 249, 'meta': {'evidence_span': ["In the wake of the Republic's collapse, state religion had adapted to support the new regime of the emperors.", 'The Roman calendar was structured around religious observances. In the Imperial era, as many as 135 days of the year were devoted to religious festivals and games ("ludi)". Women, slaves, and children all participated in a range of religious activities. In the wake of the Republic\'s collapse, state religion had adapted to support the new regime of the emperors. As the first Roman emperor, Augustus justified', 'state religion had adapted to support the new regime of the emperors. As the first Roman emperor, Augustus justified']}}]}]