<P> Queen Elizabeth II became the longest - reigning British monarch on 9 September 2015 when she surpassed the reign of her great - great - grandmother Victoria . On 6 February 2017 she became the first British monarch to celebrate a Sapphire Jubilee, commemorating 65 years on the throne . </P> <P> These are the ten longest reigning monarchs in the British Isles for whom there is reliable recorded evidence . </P> <Table> <Tr> <Th> No . </Th> <Th> Monarch </Th> <Th_colspan="2"> Reign </Th> <Th_colspan="2"> Duration </Th> </Tr> <Tr> <Th> From </Th> <Th> To </Th> <Th> Days </Th> <Th> Years, days </Th> </Tr> <Tr> <Td> </Td> <Td> Elizabeth II of the United Kingdom </Td> <Td> 6 February 1952 </Td> <Td> Present </Td> <Td> 24,309 </Td> <Td> 7004243090000000000 ♠ 66 years, 202 days </Td> </Tr> <Tr> <Td> </Td> <Td> Victoria of the United Kingdom </Td> <Td> 20 June 1837 </Td> <Td> 22 January 1901 </Td> <Td> 23,226 </Td> <Td> 63 years, 216 days </Td> </Tr> <Tr> <Td> </Td> <Td> George III of the United Kingdom </Td> <Td> 25 October 1760 </Td> <Td> 29 January 1820 </Td> <Td> 21,644 </Td> <Td> 59 years, 96 days </Td> </Tr> <Tr> <Td> </Td> <Td> James VI of Scotland </Td> <Td> 24 July 1567 </Td> <Td> 27 March 1625 </Td> <Td> 21,066 </Td> <Td> 57 years, 246 days </Td> </Tr> <Tr> <Td> 5 </Td> <Td> Henry III of England </Td> <Td> 28 October 1216 </Td> <Td> 16 November 1272 </Td> <Td> 20,473 </Td> <Td> 56 years, 19 days </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Edward III of England </Td> <Td> 25 January 1327 </Td> <Td> 20 June 1377 </Td> <Td> 18,410 </Td> <Td> 50 years, 147 days </Td> </Tr> <Tr> <Td> 7 </Td> <Td> William I of Scotland </Td> <Td> 9 December 1165 </Td> <Td> 4 December 1214 </Td> <Td> 17,892 </Td> <Td> 48 years, 360 days </Td> </Tr> <Tr> <Td> 8 </Td> <Td> Llywelyn of Gwynedd </Td> <Td> 1195 </Td> <Td> 11 April 1240 </Td> <Td> 16,173--16,902 </Td> <Td> c. 44--45 years </Td> </Tr> <Tr> <Td> 9 </Td> <Td> Elizabeth I of England </Td> <Td> 17 November 1558 </Td> <Td> 24 March 1603 </Td> <Td> 16,198 </Td> <Td> 44 years, 127 days </Td> </Tr> <Tr> <Td> 10 </Td> <Td> David II of Scotland </Td> <Td> 7 June 1329 </Td> <Td> 22 February 1371 </Td> <Td> 15,235 </Td> <Td> 41 years, 260 days </Td> </Tr> </Table> <Tr> <Th> No . </Th> <Th> Monarch </Th> <Th_colspan="2"> Reign </Th> <Th_colspan="2"> Duration </Th> </Tr>

Who is the longest reigning king in british history