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?
Sentence (from "William IV of the United Kingdom"): William IV (William Henry; 21 August 1765 – 20 June 1837) was King of the United Kingdom of Great Britain and Ireland and King of Hanover from 26 June 1830 until his death.
Relevant evidence: Yes