Which people sacked Rome in 455?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q220', 'id': 0, 'label': 'Rome'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q111600428', 'id': 1, 'label': 'Italian leaves'}, {'type': 'INTERNAL', 'name_': 'Q63726439', 'id': 2, 'label': None}], 'links': [{'name_': 'P921', 'source': 2, 'target': 0, 'label': 'main subject'}, {'name_': 'P1433', 'source': 2, 'target': 1, 'label': 'published in'}]}