In this thread, Guinastasia commented that:
I disagreed with that, and, to satisfy my own curiosity as much as anything else, did do the research on the descendants of George III:
[list=1]
[li]George Augustus Frederick (George IV, King of England), b. 12 Aug 1762, d. 26 June 1830. Only legitimate child, Caroline Augusta, b. 7 Jan (?) 1796, d.s.p. 6 Nov 1817.[/li]Illegitimate children: Georgina Frederica Augusta Elliot, b. 1782. George Milbanke, b. 1784, d.s.p. young.
[li]Frederick Augustus Duke of York, b. 16 Aug 1763, d. 20 Jan 1827. No legitimate children.[/li]One illegitimate son: Charless Hesse, killed by (ironically) Count Léon, Napoleon’s illegitimate son*.
[li]William Henry (William IV, King of England), b. 21 Aug (?) 1765, d. 20 Jun 1837. Eight legitimate children, but only three lived long enough to be named: William b. 1784, d.s.p. 1807; Charlotte Augusta Louisa, b. and d.s.p. 21 Mar 1819; Elizabeth Georgiana Adelaide, b. 10 Dec 1820, d.s.p 4 Mar 1821.[/li]Also ten illegitimate children by Dorothea Bland; surname Fitzclarence. The male line became extinct in 1901 with the death of William George 2[sup]nd[/sup] Earl of Munster, Wiliam IV’s grandson. Female lines still exist (Viscount de L’isle, etc.).
[li]Charlotte Augusta Matilda, Princess Royal, b. 29 Sep 1766, d. 6 Oct 1828. No surviving children.[/li][li]Edward Augustus Duke of Kent, b. 2 Nov 1767, d. 23 Jan 1820. One legitimate child, Queen Victoria; ‘nuff said. Some illegitimate sons by Julie de St. Laurent.[/li][li]Augusta Sophia, b. 8 Nov 1768, d.s.p. 22 Sep 1840.[/li][li]Elizabeth, b. 22 May 1770, d. 10 Jan 1840. No living descendants.[/li][li]Ernest Augustus 1[sup]st[/sup] Duke of Cumberland and Teviotdale and King of Hanover, b. 5 Jun 1771, d. 18 Nov 1851. Legitimate male line still exits (his son, George V, was deposed in 1866, and the British titles were removed in 1919).[/li][li]Augustus Frederick Duke of Sussex, b. 27 Jan 1773, d. 4 May 1843. His marriages were declared to be in violation of the Royal Marriages Act and annulled. His only son, Sir Augustus d’Este, d.s.p. 28 Dec 1848. His legitimate daughter, Mlle. Augusta d’Este, d.s.p. 21 May 1866. His illegitimate daughter, Lucy Tranter, also d.s.p.[/li][li]Adolphus Frederick, 1[sup]st[/sup] Duke of Cambridge, b. 24 Feb 1774, d. 8 Jul 1850. His son, George 2[sup]nd[/sup] Duke of Cambridge, d. 1904. His marriage was declared contrary to the Royal Marriages Act, and his eldest two sons were born out of wedlock (although he did eventually marry their mother). Surname of the sons was FitzGeorge. The male FitzGeorge line became extinct in 1960. The female FitzGeorge line still exists (Balfour). Legitimate female Cambridge lines still exist (Prince of Lippe, etc.).[/li][li]Mary, b. 25 Apr 1776, d.s.p. 30 Apr 1857.[/li][li]Sophia Matilda, b. 2 Nov 1777, d. 27 May 1848. She never married, but did have an illegitimate son, Thomas Garth, who d.s.p. after 1839.[/li][li]Octavius, b. 23 Feb 1779, d.s.p. 3 May 1783.[/li][li]Alfred, b. 22 Sep 1780, d.s.p. 20 Aug 1782.[/li][li]Amelia, b. 7 Aug 1783, d.s.p. 2 Nov 1810.[/li][/list=1]