Who was the Roman emperor at the time of Christ's death?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q842606', 'id': 0, 'label': 'Roman emperor'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q302', 'id': 1, 'label': 'Jesus'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q43982', 'id': 2, 'label': 'Bartholomew the Apostle'}, {'type': 'INTERNAL', 'name_': 'Q816528', 'id': 3, 'label': 'Ben-Hur: A Tale of the Christ'}], 'links': [{'name_': 'P802', 'source': 1, 'target': 2, 'label': 'student'}, {'name_': 'P674', 'source': 3, 'target': 0, 'label': 'characters'}, {'name_': 'P921', 'source': 3, 'target': 1, 'label': 'main subject'}]}