Question: who helped the rise of orthodox christianity in russia by converting to the religion
[{'answer': 'Princess Olga of Kiev', 'provenance': [{'wikipedia_id': '10649428', 'title': 'History of the Russian Orthodox Church', 'start_paragraph_id': 4, 'start_character': 191, 'end_paragraph_id': 4, 'end_character': 212, 'bleu_score': 1.0, 'section': "Section::::Christianization of the Rus'. The Kievan period.\n"}]}, {'answer': 'Vladimir I ( c. 956 - 1015 ) prince of Kiev'}, {'provenance': [{'wikipedia_id': '10649428', 'title': 'History of the Russian Orthodox Church', 'start_paragraph_id': 4, 'start_character': 0, 'end_paragraph_id': 4, 'end_character': 583, 'bleu_score': 0.7596104813188861, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4833701024225618492}, 'section': "Section::::Christianization of the Rus'. The Kievan period.\n"}]}]