Who was the first ruler of the Tang Dynasty?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q9683', 'id': 0, 'label': 'Tang dynasty'}, {'type': 'INTERNAL', 'name_': 'Q699639', 'id': 1, 'label': 'Li Yuanji'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q9701', 'id': 2, 'label': 'Emperor Taizong of Tang'}], 'links': [{'name_': 'P2341', 'source': 0, 'target': 0, 'label': 'indigenous to'}, {'name_': 'P27', 'source': 1, 'target': 0, 'label': 'country of citizenship'}, {'name_': 'P3373', 'source': 1, 'target': 2, 'label': 'sibling'}]}