Question: who came to britain in the middle ages
[{'answer': 'William the Conqueror', 'provenance': [{'wikipedia_id': '969337', 'title': 'England in the Middle Ages', 'start_paragraph_id': 2, 'start_character': 150, 'end_paragraph_id': 2, 'end_character': 171, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '969337', 'title': 'England in the Middle Ages', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 1055, 'bleu_score': 0.9877670085238551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6603979981739691703}, 'section': 'Section::::Abstract.'}]}]