Question: what was the power structure of the byzantine empire
[{'answer': 'Byzantine army', 'provenance': [{'wikipedia_id': '2024951', 'title': 'Byzantine army', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 14, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '2024951', 'title': 'Byzantine army', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1061, 'bleu_score': 0.988919240064389, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14191895567682007204}, 'section': 'Section::::Abstract.'}]}]