 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?
Anthony FitzClarence, 7th Earl of Munster:  The Earl of Munster was the last of the senior male line of FitzClarences that began with King William IV (Duke of Clarence until his accession in 1830) and his mistress, the comic actress Dorothea Jordan (née Bland). 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. William IV of the United Kingdom:  The third son of George III and younger brother and successor to George IV, he was the last king and penultimate monarch of Britain's House of Hanover.
i don't know