Question: who built the tower of london in 1066
[{'answer': 'William the Conqueror', 'provenance': [{'wikipedia_id': '31165', 'title': 'Tower of London', 'start_paragraph_id': 1, 'start_character': 498, 'end_paragraph_id': 1, 'end_character': 519, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31165', 'title': 'Tower of London', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 1156, 'bleu_score': 0.9904073966945661, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11816059062587235681}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31165', 'title': 'Tower of London', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11816059062587235681}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '31165', 'title': 'Tower of London', 'section': 'Section::::Abstract.', 'start_paragraph_id': 1, 'end_paragraph_id': 1, 'meta': {'evidence_span': ['William the Conqueror', "The Tower of London, officially Her Majesty's Royal Palace and Fortress of the Tower of London, is a historic castle located on the north bank of the River Thames in central London. It lies within the London Borough of Tower Hamlets, separated from the eastern edge of the square mile of the City of London by the open space known as Tower Hill. It was founded towards the end of 1066 as part of the Norman Conquest of England.", 'The White Tower, which gives the entire castle its name, was built by William the Conqueror in 1078 and was a resented symbol of oppression, inflicted upon London by the new ruling elite.']}}]}, {'provenance': [{'wikipedia_id': '33323575', 'title': 'White Tower (Tower of London)', 'section': 'Section::::History.\n', 'start_paragraph_id': 3, 'end_paragraph_id': 3, 'meta': {'evidence_span': ['William the Conqueror', 'The castle which later became known as the Tower of London was begun by William the Conqueror in 1066.']}}]}]