Question: who controlled the city of constantinople at the end of the crusades
[{'answer': 'Emperor Baldwin I of Constantinople', 'provenance': [{'wikipedia_id': '20431259', 'title': 'Sack of Constantinople (1204)', 'start_paragraph_id': 1, 'start_character': 392, 'end_paragraph_id': 1, 'end_character': 427, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '20431259', 'title': 'Sack of Constantinople (1204)', 'start_paragraph_id': 1, 'start_character': 55, 'end_paragraph_id': 1, 'end_character': 447, 'bleu_score': 0.6959499510747551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15436193257323287471}, 'section': 'Section::::Abstract.'}]}]