Question: what year did constantinople become the capital of the roman empire
[{'answer': '330', 'provenance': [{'wikipedia_id': '16972981', 'title': 'Byzantine Empire', 'start_paragraph_id': 16, 'start_character': 3, 'end_paragraph_id': 16, 'end_character': 6, 'bleu_score': 1.0, 'section': 'Section::::History.:Christianization and partition of the Empire.\n'}]}, {'provenance': [{'wikipedia_id': '16972981', 'title': 'Byzantine Empire', 'start_paragraph_id': 16, 'start_character': 0, 'end_paragraph_id': 16, 'end_character': 575, 'bleu_score': 0.8780455421575911, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 1992324261946669081}, 'section': 'Section::::History.:Christianization and partition of the Empire.\n'}]}]