Question: who became the first anglo saxon christian king
[{'answer': 'Æthelberht of Kent', 'provenance': [{'wikipedia_id': '4267183', 'title': 'Christianity in Anglo-Saxon England', 'start_paragraph_id': 6, 'start_character': 69, 'end_paragraph_id': 6, 'end_character': 87, 'bleu_score': 1.0, 'section': 'Section::::Kent.\n'}]}]