What Roman ruler invaded Britain, but did not win the war?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q6173448', 'id': 0, 'label': 'Wikipedia:Vital articles/Level/4'}, {'type': 'INTERNAL', 'name_': 'Q145', 'id': 1, 'label': 'United Kingdom'}, {'type': 'INTERNAL', 'name_': 'Q3181656', 'id': 2, 'label': 'The Nuttall Encyclopædia'}, {'type': 'INTERNAL', 'name_': 'Q486761', 'id': 3, 'label': 'classical antiquity'}, {'type': 'INTERNAL', 'name_': 'Q20056508', 'id': 4, 'label': 'Ancient Roman senator'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q1747689', 'id': 5, 'label': 'Ancient Rome'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q23666', 'id': 6, 'label': 'Great Britain'}, {'type': 'INTERNAL', 'name_': 'Q113359058', 'id': 7, 'label': 'senatrix'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q3940476', 'id': 8, 'label': 'Medieval Rome'}], 'links': [{'name_': 'P5008', 'source': 1, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P17', 'source': 1, 'target': 1, 'label': 'country'}, {'name_': 'P1889', 'source': 1, 'target': 6, 'label': 'different from'}, {'name_': 'P495', 'source': 2, 'target': 1, 'label': 'country of origin'}, {'name_': 'P5008', 'source': 3, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P706', 'source': 3, 'target': 5, 'label': 'located in/on physical feature'}, {'name_': 'P1343', 'source': 4, 'target': 2, 'label': 'described by source'}, {'name_': 'P2348', 'source': 4, 'target': 3, 'label': 'time period'}, {'name_': 'P17', 'source': 4, 'target': 5, 'label': 'country'}, {'name_': 'P5008', 'source': 6, 'target': 0, 'label': 'on focus list of Wikimedia project'}, {'name_': 'P17', 'source': 6, 'target': 1, 'label': 'country'}, {'name_': 'P279', 'source': 7, 'target': 4, 'label': 'subclass of'}, {'name_': 'P17', 'source': 7, 'target': 8, 'label': 'country'}]}