Question: where was the first motte and bailey castle built
[{'answer': 'northern Europe', 'provenance': [{'wikipedia_id': '373601', 'title': 'Motte-and-bailey castle', 'start_paragraph_id': 1, 'start_character': 344, 'end_paragraph_id': 1, 'end_character': 359, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '373601', 'title': 'Motte-and-bailey castle', 'start_paragraph_id': 19, 'start_character': 0, 'end_paragraph_id': 19, 'end_character': 1447, 'bleu_score': 0.9800946692295871, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11088015401279631891}, 'section': 'Section::::History.:Emergence of the design.\n'}]}]