With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Elizabeth II has witnessed big constitutional changes.
text_B: Elizabeth II -LRB- Elizabeth Alexandra Mary ; born 21 April 1926 -RRB- has been Queen of the United Kingdom , Canada , Australia , and New Zealand since 6 February 1952 .. Queen of the United Kingdom. Monarchy of the United Kingdom. Australia. Australia. Canada. Canada. New Zealand. New Zealand. Queen. Queen regnant. United Kingdom. United Kingdom. She is Head of the Commonwealth and Queen of 12 countries that have become independent since her accession  : Jamaica , Barbados , the Bahamas , Grenada , Papua New Guinea , Solomon Islands , Tuvalu , Saint Lucia , Saint Vincent and the Grenadines , Belize , Antigua and Barbuda , and Saint Kitts and Nevis .. Jamaica. Jamaica. Barbados. Barbados. Grenada. Grenada. Papua New Guinea. Papua New Guinea. Solomon Islands. Solomon Islands. Tuvalu. Tuvalu. Belize. Belize. Antigua and Barbuda. Antigua and Barbuda. Queen. Queen regnant. Head of the Commonwealth. Head of the Commonwealth. the Bahamas. the Bahamas. Saint Lucia. Saint Lucia. Saint Vincent and the Grenadines. Saint Vincent and the Grenadines. Saint Kitts and Nevis. Saint Kitts and Nevis. Elizabeth was born in London as the elder child of the Duke and Duchess of York , later King George VI and Queen Elizabeth , and she was educated privately at home .. George VI. George VI. London. London. Queen. Queen regnant. Queen Elizabeth. Queen Elizabeth The Queen Mother. Her father acceded to the throne on the abdication of his brother Edward VIII in 1936 , from which time she was the heir presumptive .. abdication. Edward VIII abdication crisis. Edward VIII. Edward VIII. heir presumptive. heir presumptive. She began to undertake public duties during the Second World War , serving in the Auxiliary Territorial Service .. Second World War. World War II. Auxiliary Territorial Service. Auxiliary Territorial Service. In 1947 , she married Philip , Duke of Edinburgh , a former prince of Greece and Denmark , with whom she has four children  : Charles , Prince of Wales ; Anne , Princess Royal ; Prince Andrew , Duke of York ; and Prince Edward , Earl of Wessex .. Elizabeth 's many historic visits and meetings include a state visit to the Republic of Ireland and visits to or from five popes .. state visit to the Republic of Ireland. Queen Elizabeth II's state visit to the Republic of Ireland. She has seen major constitutional changes , such as devolution in the United Kingdom , Canadian patriation , and the decolonisation of Africa .. United Kingdom. United Kingdom. devolution. devolution in the United Kingdom. patriation. patriation. decolonisation of Africa. decolonisation of Africa. She has reigned through various wars and conflicts involving many of her realms .. her realms. States headed by Elizabeth II. She is the world 's oldest reigning monarch as well as Britain 's longest-lived .. oldest reigning monarch. Lists of state leaders by age#10 oldest currently serving state leaders. longest-lived. List of British monarchs by longevity. In 2015 , she surpassed the reign of her great-great-grandmother , Queen Victoria , to become the longest-reigning British monarch and the longest-reigning queen regnant and female head of state in world history .. Queen. Queen regnant. Queen Victoria. Queen Victoria. longest-reigning British monarch. List of monarchs in Britain by length of reign. longest-reigning queen regnant. List of longest-reigning monarchs. head of state. List of current state leaders by date of assumption of office. In October 2016 , she became the longest currently reigning monarch and head of state following the death of King Bhumibol Adulyadej of Thailand .. head of state. List of current state leaders by date of assumption of office. longest currently reigning monarch. Current reigning monarchs by length of reign. death of King Bhumibol Adulyadej. Death and funeral of Bhumibol Adulyadej. Thailand. Thailand. Times of personal significance have included the births and marriages of her children , her coronation in 1953 , and the celebration of milestones such as her Silver , Golden , and Diamond Jubilees in 1977 , 2002 , and 2012 , respectively .. coronation in 1953. Coronation of Queen Elizabeth II. Silver. Silver Jubilee of Elizabeth II. Golden. Golden Jubilee of Elizabeth II. Diamond. Diamond Jubilee of Elizabeth II. In 2017 she became the first British monarch to commemorate a Sapphire Jubilee .. Sapphire Jubilee. Sapphire Jubilee of Queen Elizabeth II. 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 -LRB- her annus horribilis -RRB- ; the death in 1997 of her son 's former wife , Diana , Princess of Wales ; and the deaths of her mother and sister in 2002 .. Lord Mountbatten. Louis Mountbatten, 1st Earl Mountbatten of Burma. annus horribilis. Annus horribilis#Elizabeth II. sister. Princess Margaret, Countess of Snowdon. Elizabeth has occasionally faced republican sentiments and press criticism of the royal family ; however , support for the monarchy remains high , as does her personal popularity .. republican. Republicanism in the United Kingdom. royal family. British royal family
related.