Question: Anthony Charles FitzClarence was the last of the senior male line that began with the third son of George III and younger brother and successor to who?
{'answer': 'George IV', 'supporting_facts': [['Anthony FitzClarence, 7th Earl of Munster', 0], ['Anthony FitzClarence, 7th Earl of Munster', 1], ['William IV of the United Kingdom', 0], ['William IV of the United Kingdom', 1]]}