Question: who were the first kings to issue coins bearing their names
[{'answer': 'the Indo - Greek kings', 'provenance': [{'wikipedia_id': '1458025', 'title': 'Satavahana dynasty', 'start_paragraph_id': 85, 'start_character': 245, 'end_paragraph_id': 85, 'end_character': 268, 'bleu_score': 1.0, 'section': 'Section::::Coinage.\n'}]}, {'provenance': [{'wikipedia_id': '1458025', 'title': 'Satavahana dynasty', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 0, 'bleu_score': 1.0, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11630466012314835200}, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '1458025', 'title': 'Satavahana dynasty', 'start_paragraph_id': 85, 'start_character': 0, 'end_paragraph_id': 85, 'end_character': 282, 'bleu_score': 0.955027111100031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 11630466012314835200}, 'section': 'Section::::Coinage.\n'}]}, {'provenance': [{'wikipedia_id': '1458025', 'title': 'Satavahana dynasty', 'section': 'Section::::Coinage.\n', 'start_paragraph_id': 85, 'end_paragraph_id': 85, 'meta': {'evidence_span': ['the Indo-Greek kings', 'itself originating with the Indo-Greek kings to the northwest.', 'The Satavahanas are among the earliest Indian rulers to issue their own coins with portraits of their rulers, starting with king Gautamiputra Satakarni, a practice derived from that of the Western Kshatrapas he defeated, itself originating with the Indo-Greek kings to the northwest.']}}]}]