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Windsor Castle, Berkshire, England

Windsor Castle, Berkshire, England

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Portrait of King George III of Great Britain (engraving), c 1775. (Photo by GraphicaArtis/Getty Images)

Portrait of King George III of Great Britain (engraving), c 1775. (Photo by GraphicaArtis/Getty Images)

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King George V, early 20th century. Portrait of George Frederick Ernest Albert (1865-1936). (Photo by The Print Collector/Print Collector/Getty Images)

King George V, early 20th century. Portrait of George Frederick Ernest Albert (1865-1936). (Photo by The Print Collector/Print Collector/Getty Images)

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British Royalty, pic: June 1934, HM, King George V with Queen Mary and with the young Princess Elizabeth on the way to Westminster Abbey, to attend a pilgramage to Cathedrals on behalf of the unemployed (Photo by Popperfoto/Getty Images)

British Royalty, pic: June 1934, HM, King George V with Queen Mary and with the young Princess Elizabeth on the way to Westminster Abbey, to attend a pilgramage to Cathedrals on behalf of the unemployed  (Photo by Popperfoto/Getty Images)

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LONDON, ENGLAND - JUNE 13: (L-R) Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Prince George of Cambridge, Prince William, Duke of Cambridge Catherine, Duchess of Cambridge, Queen Elizabeth II and Prince Harry look on from the balcony during the annual Trooping The Colour ceremony at Horse Guards Parade on June 13, 2015 in London, England. (Photo by Samir Hussein/WireImage)

LONDON, ENGLAND - JUNE 13:  (L-R) Camilla, Duchess of Cornwall, Prince Charles, Prince of Wales, Prince George of Cambridge, Prince William, Duke of Cambridge Catherine, Duchess of Cambridge, Queen Elizabeth II and Prince Harry  look on from the balcony during the annual Trooping The Colour ceremony at Horse Guards Parade on June 13, 2015 in London, England.  (Photo by Samir Hussein/WireImage)