Question: Whose father was an Anglo-Saxon king of Mercia from 852 to 874?
{'answer': 'Beorhtweald Ealdorman of Kent', 'supporting_facts': [['Beorhtweald Ealdorman of Kent', 0], ['Beorhtweald Ealdorman of Kent', 1], ['Burgred of Mercia', 0]]}