Who was the longest reigning king of France?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q142', 'id': 0, 'label': 'France'}, {'type': 'INTERNAL', 'name_': 'Q2493884', 'id': 1, 'label': 'The Gleaners and I'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q1985804', 'id': 2, 'label': 'culture of France'}], 'links': [{'name_': 'P495', 'source': 1, 'target': 0, 'label': 'country of origin'}, {'name_': 'P921', 'source': 1, 'target': 2, 'label': 'main subject'}]}