Question: who used to identify themselves through a coat of arms
[{'answer': 'feudal lords'}, {'answer': 'knights'}, {'answer': 'clergy', 'provenance': [{'wikipedia_id': '55284', 'title': 'Coat of arms', 'start_paragraph_id': 11, 'start_character': 55, 'end_paragraph_id': 11, 'end_character': 61, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'towns', 'provenance': [{'wikipedia_id': '55284', 'title': 'Coat of arms', 'start_paragraph_id': 11, 'start_character': 66, 'end_paragraph_id': 11, 'end_character': 71, 'bleu_score': 1.0, 'section': 'Section::::History.\n'}]}, {'answer': 'royally chartered organizations such as universities and trading companies'}, {'answer': 'families in the higher social classes of Europe'}]