Question: which european group forged an alliance with the ethiopian kingdom in the 1540s
[{'answer': 'the Portuguese', 'provenance': [{'wikipedia_id': '20609740', 'title': 'History of Ethiopia', 'start_paragraph_id': 38, 'start_character': 704, 'end_paragraph_id': 38, 'end_character': 718, 'bleu_score': 1.0, 'section': 'Section::::Middle Ages.:Zagwe Dynasty.:Foreign Affairs.\n'}]}, {'provenance': [{'wikipedia_id': '20609740', 'title': 'History of Ethiopia', 'start_paragraph_id': 47, 'start_character': 0, 'end_paragraph_id': 47, 'end_character': 640, 'bleu_score': 0.9808590314834971, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9590682846574939706}, 'section': 'Section::::Middle Ages.:Early Solomonic period (1270–1529).:The Abyssinian-Adal War (1529–1543).\n'}]}]