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LONDON, ENGLAND - MAY 18:  Queen Elizabeth II and Prince Harry attend at the annual Chelsea Flower show at Royal Hospital Chelsea on May 18, 2015 in London, England.  (Photo by Julian Simmonds - WPA Pool / Getty Images)
LONDON, ENGLAND - MAY 18:  Queen Elizabeth II and Prince Harry attend at the annual Chelsea Flower show at Royal Hospital Chelsea on May 18, 2015 in London, England.  (Photo by Julian Simmonds - WPA Pool / Getty Images)

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    See Queen's letter about Harry's marriage

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See Queen's letter about Harry's marriage

Prince Harry's marriage to Meghan Markle required approval by the Archbishop and Harry's grandmother, Queen Elizabeth, in part because Markle is divorced. CNN's Max Foster explains the Royal protocol.

See Queen's letter about Harry's marriage

Prince Harry's marriage to Meghan Markle required approval by the Archbishop and Harry's grandmother, Queen Elizabeth, in part because Markle is divorced. CNN's Max Foster explains the Royal protocol.