Question: when did the roman capital moved to constantinople
[{'answer': '324', 'provenance': [{'wikipedia_id': '5646', 'title': 'Constantinople', 'start_paragraph_id': 2, 'start_character': 3, 'end_paragraph_id': 2, 'end_character': 6, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]