Question: who first held that the trinity is defined as one substance in three persons
[{'answer': 'Theophilus of Antioch', 'provenance': [{'wikipedia_id': '30511', 'title': 'Trinity', 'start_paragraph_id': 5, 'start_character': 161, 'end_paragraph_id': 5, 'end_character': 182, 'bleu_score': 1.0, 'section': 'Section::::Etymology.\n'}]}, {'provenance': [{'wikipedia_id': '30511', 'title': 'Trinity', 'start_paragraph_id': 9, 'start_character': 937, 'end_paragraph_id': 9, 'end_character': 2166, 'bleu_score': 0.648334534125335, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6810768942428016709}, 'section': 'Section::::History.:From the Ante-Nicene Fathers to Nicaea.\n'}]}]