Question: who led the most successful slave revolt in roman history
[{'answer': 'Spartacus', 'provenance': [{'wikipedia_id': '54959', 'title': 'Slave rebellion', 'start_paragraph_id': 2, 'start_character': 336, 'end_paragraph_id': 2, 'end_character': 345, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '54959', 'title': 'Slave rebellion', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 477, 'bleu_score': 0.946997238355009, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11444860265477167653}, 'section': 'Section::::Abstract.'}]}]