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LONDON, ENGLAND - JULY 12: Queen Elizabeth II, Prince Philip, Duke of Edinburgh, King Felipe VI and Queen Letizia of Spain attend a Ceremonial Welcome on Horse Guards Parade on July 12, 2017 in London, England. This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia. (Photo by Matt Dunham - WPA Pool/Getty Images)

LONDON, ENGLAND - JULY 12:  Queen Elizabeth II, Prince Philip, Duke of Edinburgh, King Felipe VI and Queen Letizia of Spain attend a Ceremonial Welcome on Horse Guards Parade on July 12, 2017 in London, England.  This is the first state visit by the current King Felipe and Queen Letizia, the last being in 1986 with King Juan Carlos and Queen Sofia.   (Photo by  Matt Dunham - WPA Pool/Getty Images)