Question: who is often regarded as the father of international law
[{'answer': 'Alberico Gentili', 'provenance': [{'wikipedia_id': '8195726', 'title': 'International law', 'start_paragraph_id': 18, 'start_character': 814, 'end_paragraph_id': 18, 'end_character': 830, 'bleu_score': 1.0, 'section': 'Section::::History.:Emergence of modern international law.\n'}]}, {'answer': 'Francisco de Vitoria', 'provenance': [{'wikipedia_id': '8195726', 'title': 'International law', 'start_paragraph_id': 19, 'start_character': 171, 'end_paragraph_id': 19, 'end_character': 191, 'bleu_score': 1.0, 'section': 'Section::::History.:Emergence of modern international law.\n'}]}, {'answer': 'Hugo Grotius', 'provenance': [{'wikipedia_id': '8195726', 'title': 'International law', 'start_paragraph_id': 20, 'start_character': 17, 'end_paragraph_id': 20, 'end_character': 29, 'bleu_score': 1.0, 'section': 'Section::::History.:Emergence of modern international law.\n'}]}]