Question: who is generally considered the first king of the inka empire
[{'answer': 'Pachacuti', 'provenance': [{'wikipedia_id': '15319', 'title': 'Inca Empire', 'start_paragraph_id': 21, 'start_character': 213, 'end_paragraph_id': 21, 'end_character': 222, 'bleu_score': 1.0, 'section': 'Section::::History.:Kingdom of Cusco.\n'}]}]