Question: when did the romans first come to britain
[{'answer': '54 BC', 'provenance': [{'wikipedia_id': '13525', 'title': 'Roman Britain', 'start_paragraph_id': 9, 'start_character': 90, 'end_paragraph_id': 9, 'end_character': 95, 'bleu_score': 1.0, 'section': 'Section::::History.:Early contact.\n'}]}, {'provenance': [{'wikipedia_id': '13525', 'title': 'Roman Britain', 'start_paragraph_id': 2, 'start_character': 99, 'end_paragraph_id': 2, 'end_character': 1057, 'bleu_score': 0.781097587173714, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 12051909306385840336}, 'section': 'Section::::Abstract.'}]}]