Question: who plays the head maester in game of thrones
[{'answer': 'Julian Glover', 'provenance': [{'wikipedia_id': '28059680', 'title': 'List of Game of Thrones characters', 'start_paragraph_id': 367, 'start_character': 61, 'end_paragraph_id': 367, 'end_character': 74, 'bleu_score': 1.0, 'section': 'Section::::Supporting characters.:Royal court and officials.\n'}]}]