Question: when did the celts settle in northern italy
[{'answer': '279 BC', 'provenance': [{'wikipedia_id': '6546', 'title': 'Celts', 'start_paragraph_id': 2, 'start_character': 802, 'end_paragraph_id': 2, 'end_character': 808, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '6546', 'title': 'Celts', 'start_paragraph_id': 2, 'start_character': 0, 'end_paragraph_id': 2, 'end_character': 874, 'bleu_score': 0.7273042356665681, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18023391308169048519}, 'section': 'Section::::Abstract.'}]}]