Premise: Elizabeth II ( Elizabeth Alexandra Mary ; born 21 April 1926 ) has been Queen of the United Kingdom , Canada , Australia , and New Zealand since 6 February 1952 . In October 2016 , she became the longest currently reigning monarch and head of state following the death of King Bhumibol Adulyadej of Thailand . In 2017 she became the first British monarch to commemorate a Sapphire Jubilee . Moments of sadness for her include the death of her father in 1952 at age 56 ; the assassination of Prince Philip 's uncle Lord Mountbatten in 1979 ; the breakdown of her children 's marriages in 1992 ( her annus horribilis ) ; the death in 1997 of her son 's former wife , Diana , Princess of Wales ; and the deaths of her mother and sister in 2002 . George VI ( Albert Frederick Arthur George ; 14 December 1895 -- 6 February 1952 ) was King of the United Kingdom and the Dominions of the British Commonwealth from 11 December 1936 until his death .
Hypothesis: Elizabeth II was murdered on 21 April 1926.
Label: CONTRADICTION