Question: who was the english king who introduced the use of juries
[{'answer': 'Æthelred the Unready', 'provenance': [{'wikipedia_id': '27196033', 'title': 'History of trial by jury in England', 'start_paragraph_id': 5, 'start_character': 17, 'end_paragraph_id': 5, 'end_character': 37, 'bleu_score': 1.0, 'section': 'Section::::History.:Anglo-Saxon England.\n'}]}, {'provenance': [{'wikipedia_id': '27196033', 'title': 'History of trial by jury in England', 'start_paragraph_id': 5, 'start_character': 0, 'end_paragraph_id': 5, 'end_character': 420, 'bleu_score': 0.9699161750394991, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13690457777154654900}, 'section': 'Section::::History.:Anglo-Saxon England.\n'}]}]