<Li> Example 1: 4 July 1776 . This falls in the reign of George III, whose first regnal year is 1760; so 1776--1760 = 16th year of his reign (4 July is before 25 October). </Li> <Li> Example 2: 2 May 1662 . This is in the reign of Charles II, whose first regnal year is 1649 . So 1662--1649 = 13, add 1 because 2 May is after 30 January, so the date falls in the 14th regnal year of Charles II . </Li> <Table> <Tr> <Th> Monarch </Th> <Th> No. of Years </Th> <Th> First regnal year </Th> <Th> Regnal year start date </Th> <Th> Regnal year end date </Th> <Th> End of final year </Th> </Tr> <Tr> <Td> William I </Td> <Td> 21 </Td> <Td> 1066 </Td> <Td> 14 October </Td> <Td> 13 October </Td> <Td> 9 Sep 1087 </Td> </Tr> <Tr> <Td> William II </Td> <Td> 13 </Td> <Td> 1087 </Td> <Td> 26 September </Td> <Td> 25 September </Td> <Td> 2 Aug 1100 </Td> </Tr> <Tr> <Td> Henry I </Td> <Td> 36 </Td> <Td> 1100 </Td> <Td> 5 August </Td> <Td> 4 August </Td> <Td> 1 Dec 1135 </Td> </Tr> <Tr> <Td> Stephen </Td> <Td> 19 </Td> <Td> 1135 </Td> <Td> 26 December </Td> <Td> 25 December </Td> <Td> 25 Oct 1154 </Td> </Tr> <Tr> <Td> Henry II </Td> <Td> 35 </Td> <Td> 1154 </Td> <Td> 19 December </Td> <Td> 18 December </Td> <Td> 6 Jul 1189 </Td> </Tr> <Tr> <Td> Richard I </Td> <Td> 10 </Td> <Td> 1189 </Td> <Td> 3 September </Td> <Td> 2 September </Td> <Td> 6 Apr 1199 </Td> </Tr> <Tr> <Td> </Td> <Td> 18 </Td> <Td> 1199 </Td> <Td> May (Ascension Day) </Td> <Td> May (varied) </Td> <Td> 19 Oct 1216 </Td> </Tr> <Tr> <Td> Henry III </Td> <Td> 57 </Td> <Td> 1216 </Td> <Td> 28 October </Td> <Td> 27 October </Td> <Td> 16 Nov 1272 </Td> </Tr> <Tr> <Td> Edward I </Td> <Td> 35 </Td> <Td> 1272 </Td> <Td> 20 November </Td> <Td> 20 November </Td> <Td> 7 Jul 1307 </Td> </Tr> <Tr> <Td> Edward II </Td> <Td> 20 </Td> <Td> 1307 </Td> <Td> 8 July </Td> <Td> 7 July </Td> <Td> 20 Jan 1327 </Td> </Tr> <Tr> <Td> Edward III </Td> <Td> 51 (England), 38 (France) </Td> <Td> 1327 </Td> <Td> 25 January </Td> <Td> 24 January </Td> <Td> 21 Jun 1377 </Td> </Tr> <Tr> <Td> Richard II </Td> <Td> 23 </Td> <Td> 1377 </Td> <Td> 22 June </Td> <Td> 21 June </Td> <Td> 29 Sep 1399 </Td> </Tr> <Tr> <Td> Henry IV </Td> <Td> 14 </Td> <Td> 1399 </Td> <Td> 30 September </Td> <Td> 29 September </Td> <Td> 20 Mar 1413 </Td> </Tr> <Tr> <Td> Henry V </Td> <Td> 10 </Td> <Td> 1413 </Td> <Td> 21 March </Td> <Td> 20 March </Td> <Td> 31 Aug 1422 </Td> </Tr> <Tr> <Td> Henry VI </Td> <Td> 39 + 1 </Td> <Td> 1422 </Td> <Td> 1 September </Td> <Td> 31 August </Td> <Td> 4 Mar 1461 </Td> </Tr> <Tr> <Td> Edward IV </Td> <Td> 23 </Td> <Td> 1461 </Td> <Td> 4 March </Td> <Td> 3 March </Td> <Td> 9 Apr 1483 </Td> </Tr> <Tr> <Td> Edward V </Td> <Td> </Td> <Td> 1483 </Td> <Td> 9 April </Td> <Td> 25 June </Td> <Td> 25 Jun 1483 </Td> </Tr> <Tr> <Td> Richard III </Td> <Td> </Td> <Td> 1483 </Td> <Td> 26 June </Td> <Td> 25 June </Td> <Td> 22 Aug 1485 </Td> </Tr> <Tr> <Td> Henry VII </Td> <Td> 24 </Td> <Td> 1485 </Td> <Td> 22 August </Td> <Td> 21 August </Td> <Td> 21 Apr 1509 </Td> </Tr> <Tr> <Td> Henry VIII </Td> <Td> 38 </Td> <Td> 1509 </Td> <Td> 22 April </Td> <Td> 21 April </Td> <Td> 28 Jan 1547 </Td> </Tr> <Tr> <Td> Edward VI </Td> <Td> 7 </Td> <Td> 1547 </Td> <Td> 28 January </Td> <Td> 27 January </Td> <Td> 6 Jul 1553 </Td> </Tr> <Tr> <Td> Mary I </Td> <Td> </Td> <Td> 1553 </Td> <Td> 6 July </Td> <Td> 5 July </Td> <Td> 24 Jul 1554 </Td> </Tr> <Tr> <Td> "Philip and Mary" </Td> <Td> 5 & 6 </Td> <Td> 1554 </Td> <Td> 25 July </Td> <Td> 24 July </Td> <Td> 17 Nov 1558 </Td> </Tr> <Tr> <Td> Elizabeth I </Td> <Td> 45 </Td> <Td> 1558 </Td> <Td> 17 November </Td> <Td> 16 November </Td> <Td> 24 Mar 1603 </Td> </Tr> <Tr> <Td> James I </Td> <Td> 23 </Td> <Td> 1603 </Td> <Td> 25 March </Td> <Td> 24 March </Td> <Td> 27 Mar 1625 </Td> </Tr> <Tr> <Td> Charles I </Td> <Td> 24 </Td> <Td> 1625 </Td> <Td> 27 March </Td> <Td> 26 March </Td> <Td> 30 Jan 1649 </Td> </Tr> <Tr> <Td> Charles II </Td> <Td> 37 </Td> <Td> 1649 </Td> <Td> 30 January </Td> <Td> 29 January </Td> <Td> 6 Feb 1685 </Td> </Tr> <Tr> <Td> James II </Td> <Td> </Td> <Td> 1685 </Td> <Td> 6 February </Td> <Td> 5 February </Td> <Td> 11 Dec 1688 </Td> </Tr> <Tr> <Td> "William and Mary" </Td> <Td> 6 </Td> <Td> 1689 </Td> <Td> 13 February </Td> <Td> 12 February </Td> <Td> 27 Dec 1694 </Td> </Tr> <Tr> <Td> William III </Td> <Td> 8 (7 to 14) </Td> <Td> 1694 </Td> <Td> 28 December </Td> <Td> 27 December </Td> <Td> 8 Mar 1702 </Td> </Tr> <Tr> <Td> Anne </Td> <Td> 13 </Td> <Td> 1702 </Td> <Td> 8 March </Td> <Td> 7 March </Td> <Td> 1 Aug 1714 </Td> </Tr> <Tr> <Td> George I </Td> <Td> 13 </Td> <Td> 1714 </Td> <Td> 1 August </Td> <Td> 31 July </Td> <Td> 11 Jun 1727 </Td> </Tr> <Tr> <Td> George II </Td> <Td> 34 </Td> <Td> 1727 </Td> <Td> 11 June </Td> <Td> 10 June </Td> <Td> 25 Oct 1760 </Td> </Tr> <Tr> <Td> George III </Td> <Td> 60 </Td> <Td> 1760 </Td> <Td> 25 October </Td> <Td> 24 October </Td> <Td> 29 Jan 1820 </Td> </Tr> <Tr> <Td> George IV </Td> <Td> 11 </Td> <Td> 1820 </Td> <Td> 29 January </Td> <Td> 28 January </Td> <Td> 26 Jun 1830 </Td> </Tr> <Tr> <Td> William IV </Td> <Td> 7 </Td> <Td> 1830 </Td> <Td> 26 June </Td> <Td> 25 June </Td> <Td> 20 Jun 1837 </Td> </Tr> <Tr> <Td> Victoria </Td> <Td> 64 </Td> <Td> 1837 </Td> <Td> 20 June </Td> <Td> 19 June </Td> <Td> 22 Jan 1901 </Td> </Tr> <Tr> <Td> Edward VII </Td> <Td> 10 </Td> <Td> 1901 </Td> <Td> 22 January </Td> <Td> 21 January </Td> <Td> 6 May 1910 </Td> </Tr> <Tr> <Td> George V </Td> <Td> 26 </Td> <Td> 1910 </Td> <Td> 6 May </Td> <Td> 5 May </Td> <Td> 20 Jan 1936 </Td> </Tr> <Tr> <Td> Edward VIII </Td> <Td> </Td> <Td> 1936 </Td> <Td> 20 January </Td> <Td> 11 December </Td> <Td> 11 Dec 1936 </Td> </Tr> <Tr> <Td> George VI </Td> <Td> 16 </Td> <Td> 1936 </Td> <Td> 11 December </Td> <Td> 10 December </Td> <Td> 5 Feb 1952 </Td> </Tr> <Tr> <Td> Elizabeth II </Td> <Td> (ongoing; 2018 = 66 Eliz. 2--67 Eliz. 2) </Td> <Td> 1952 </Td> <Td> 6 February </Td> <Td> 5 February </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Monarch </Th> <Th> No. of Years </Th> <Th> First regnal year </Th> <Th> Regnal year start date </Th> <Th> Regnal year end date </Th> <Th> End of final year </Th> </Tr>

Who was the reigning monarch on christmas day 1949