Question: who remained the head of the church in the eastern roman empire
[{'answer': 'Emperor Theodosius I', 'provenance': [{'wikipedia_id': '27928643', 'title': 'State church of the Roman Empire', 'start_paragraph_id': 1, 'start_character': 42, 'end_paragraph_id': 1, 'end_character': 62, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}]