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Britain's Queen Elizabeth II attends a reception to mark the launch of the UK-India Year of Culture 2017 at Buckingham Palace in London on February 27, 2017. / AFP / POOL / Jonathan Brady (Photo credit should read JONATHAN BRADY/AFP/Getty Images)

Britain's Queen Elizabeth II attends a reception to mark the launch of the UK-India Year of Culture 2017 at Buckingham Palace in London on February 27, 2017.  / AFP / POOL / Jonathan Brady        (Photo credit should read JONATHAN BRADY/AFP/Getty Images)

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Britain's Queen Elizabeth II attends the official opening of a new development at the Charterhouse in London on February 28, 2017. The Charterhouse, located adjacent to the ancient boundaries of the City of London in Clerkenwell, was originally constructed in 1371 on the site of a Black Death burial ground. The building began life as a Cathusian monastery, which flourished during the late Medieval and early Tudor period. In more recent times it has served as an almshouse. Residents of the almshouse are known as "brothers." With a minimum age of sixty, they are selected from a range of professions including education, the clergy, and the arts. Those who become brothers are considered in need of financial support. / AFP / POOL / Chris Jackson (Photo credit should read CHRIS JACKSON/AFP/Getty Images)

Britain's Queen Elizabeth II attends the official opening of a new development at the Charterhouse in London on February 28, 2017.
The Charterhouse, located adjacent to the ancient boundaries of the City of London in Clerkenwell, was originally constructed in 1371 on the site of a Black Death burial ground. The building began life as a Cathusian monastery, which flourished during the late Medieval and early Tudor period. In more recent times it has served as an almshouse. Residents of the almshouse are known as "brothers." With a minimum age of sixty, they are selected from a range of professions including education, the clergy, and the arts. Those who become brothers are considered in need of financial support. / AFP / POOL / Chris Jackson        (Photo credit should read CHRIS JACKSON/AFP/Getty Images)

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Britain's Queen Elizabeth II (R) receives flowers from a child as she attends the official opening of a new development at the Charterhouse in London on February 28, 2017. The Charterhouse, located adjacent to the ancient boundaries of the City of London in Clerkenwell, was originally constructed in 1371 on the site of a Black Death burial ground. The building began life as a Cathusian monastery, which flourished during the late Medieval and early Tudor period. In more recent times it has served as an almshouse. Residents of the almshouse are known as "brothers." With a minimum age of sixty, they are selected from a range of professions including education, the clergy, and the arts. Those who become brothers are considered in need of financial support. / AFP / POOL / Chris Jackson (Photo credit should read CHRIS JACKSON/AFP/Getty Images)

Britain's Queen Elizabeth II (R) receives flowers from a child as she attends the official opening of a new development at the Charterhouse in London on February 28, 2017.
The Charterhouse, located adjacent to the ancient boundaries of the City of London in Clerkenwell, was originally constructed in 1371 on the site of a Black Death burial ground. The building began life as a Cathusian monastery, which flourished during the late Medieval and early Tudor period. In more recent times it has served as an almshouse. Residents of the almshouse are known as "brothers." With a minimum age of sixty, they are selected from a range of professions including education, the clergy, and the arts. Those who become brothers are considered in need of financial support. / AFP / POOL / Chris Jackson        (Photo credit should read CHRIS JACKSON/AFP/Getty Images)

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Britain's Queen Elizabeth II (2R) and her husband Britain's Prince Philip, Duke of Edinburgh (R) attend the official opening of a new development at the Charterhouse in London on February 28, 2017. The Charterhouse, located adjacent to the ancient boundaries of the City of London in Clerkenwell, was originally constructed in 1371 on the site of a Black Death burial ground. The building began life as a Cathusian monastery, which flourished during the late Medieval and early Tudor period. In more recent times it has served as an almshouse. Residents of the almshouse are known as "brothers." With a minimum age of sixty, they are selected from a range of professions including education, the clergy, and the arts. Those who become brothers are considered in need of financial support. / AFP / POOL / Chris Jackson (Photo credit should read CHRIS JACKSON/AFP/Getty Images)

Britain's Queen Elizabeth II (2R) and her husband Britain's Prince Philip, Duke of Edinburgh (R) attend the official opening of a new development at the Charterhouse in London on February 28, 2017.
The Charterhouse, located adjacent to the ancient boundaries of the City of London in Clerkenwell, was originally constructed in 1371 on the site of a Black Death burial ground. The building began life as a Cathusian monastery, which flourished during the late Medieval and early Tudor period. In more recent times it has served as an almshouse. Residents of the almshouse are known as "brothers." With a minimum age of sixty, they are selected from a range of professions including education, the clergy, and the arts. Those who become brothers are considered in need of financial support. / AFP / POOL / Chris Jackson        (Photo credit should read CHRIS JACKSON/AFP/Getty Images)

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LONDON, UNITED KINGDOM - MARCH 1: Queen Elizabeth II shakes hands with Mrs Nkambule, the wife of His Excellency Mr Christian Muzie Nkambule the High Commissioner of Swaziland, after he presented his Letters of Credence to Her Majesty, during a private audience at Buckingham Palace on March 1, 2017 in London, England. (Photo by John Stillwell-WPA Pool/Getty Images)

LONDON, UNITED KINGDOM - MARCH 1: Queen Elizabeth II shakes hands with Mrs Nkambule, the wife of His Excellency Mr Christian Muzie Nkambule the High Commissioner of Swaziland, after he presented his Letters of Credence to Her Majesty, during a private audience at Buckingham Palace on March 1, 2017 in London, England.  (Photo by John Stillwell-WPA Pool/Getty Images)