Who was the first ruler of Egypt during the Ptolemaic period?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'QUESTIONS_ENTITY', 'name_': 'Q79', 'id': 0, 'label': 'Egypt'}, {'type': 'INTERNAL', 'name_': 'Q860861', 'id': 1, 'label': 'sculpture'}, {'type': 'INTERNAL', 'name_': 'Q754378', 'id': 2, 'label': 'Merneptah Stele'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q114860241', 'id': 3, 'label': 'Ptolemy I'}], 'links': [{'name_': 'P17', 'source': 2, 'target': 0, 'label': 'country'}, {'name_': 'P31', 'source': 2, 'target': 1, 'label': 'instance of'}, {'name_': 'P31', 'source': 3, 'target': 1, 'label': 'instance of'}]}