Question: who conquered the persian empire and most of the ancient world
[{'answer': 'Islamic caliphate', 'provenance': [{'wikipedia_id': '24187128', 'title': 'Persian Empire', 'start_paragraph_id': 7, 'start_character': 126, 'end_paragraph_id': 7, 'end_character': 143, 'bleu_score': 1.0, 'section': 'Section::::History.:Sasanians.\n'}]}, {'provenance': [{'wikipedia_id': '24187128', 'title': 'Persian Empire', 'start_paragraph_id': 7, 'start_character': 39, 'end_paragraph_id': 7, 'end_character': 308, 'bleu_score': 0.859116975907879, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 10176058604920929882}, 'section': 'Section::::History.:Sasanians.\n'}]}]