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HAMPSHIRE, ENGLAND - UNDATED: In this image, made available November 18, 2007, HM The Queen Elizabeth II and Prince Philip, The Duke of Edinburgh re-visit Broadlands, to mark their Diamond Wedding Anniversary on November 20. The royals spent their wedding night at Broadlands in Hampshire in November 1947, the former home of Prince Philip's uncle, Earl Mountbatten. (Photo by Tim Graham/Getty Images)

HAMPSHIRE, ENGLAND - UNDATED: In this image, made available November 18, 2007, HM The Queen Elizabeth II and Prince Philip, The Duke of Edinburgh re-visit Broadlands,  to mark their Diamond Wedding Anniversary on November 20. The royals spent their wedding night at Broadlands in Hampshire in November 1947,  the former home of Prince Philip's uncle, Earl Mountbatten. (Photo by Tim Graham/Getty Images)

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24th November 1947: Princess Elizabeth and The Prince Philip, Duke of Edinburgh enjoying a walk during their honeymoon at Broadlands, Romsey, Hampshire. (Photo by Topical Press Agency/Getty Images)

24th November 1947:  Princess Elizabeth and The Prince Philip, Duke of Edinburgh enjoying a walk during their honeymoon at Broadlands, Romsey, Hampshire.  (Photo by Topical Press Agency/Getty Images)

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LONDON, ENGLAND - MARCH 13: Prince Philip, Duke of Edinburgh (R) and Queen Elizabeth II depart a Service of Commemoration for troops who were stationed in Afghanistan on March 13, 2015 in London, England. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - MARCH 13:  Prince Philip, Duke of Edinburgh (R) and Queen Elizabeth II depart a Service of Commemoration for troops who were stationed in Afghanistan on March 13, 2015 in London, England.  (Photo by Chris Jackson/Getty Images)

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Princess Elizabeth (later Queen Elizabeth II) and her fiance, Philip Mountbatten at Buckingham Palace, after their engagement was announced, 10th July 1947. (Photo by Topical Press Agency/Hulton Archive/Getty Images)

Princess Elizabeth (later Queen Elizabeth II) and her fiance, Philip Mountbatten at Buckingham Palace, after their engagement was announced, 10th July 1947. (Photo by Topical Press Agency/Hulton Archive/Getty Images)

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Queen Elizabeth II, as Princess Elizabeth, and her husband the Duke of Edinburgh, styled Prince Philip in 1957, on their wedding day. She became queen on her father King George VI's death in 1952. (Photo by Hulton Archive/Getty Images)

Queen Elizabeth II, as Princess Elizabeth, and her husband the Duke of Edinburgh, styled Prince Philip in 1957, on their wedding day. She became queen on her father King George VI's death in 1952.   (Photo by Hulton Archive/Getty Images)