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OXFORD, ENGLAND - JULY 14: King Felipe of Spain (C) and Queen Letizia of Spain are shown the Ulm Ptolemy, a woodcut world map published in 1486, during a visit to the Weston Library during their State visit to the UK on July 14, 2017 in Oxford, 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 Chris J Ratcliffe - WPA Pool/Getty Images)

OXFORD, ENGLAND - JULY 14: King Felipe of Spain (C) and Queen Letizia of Spain are shown the Ulm Ptolemy, a woodcut world map published in 1486, during a visit to the Weston Library during their State visit to the UK on July 14, 2017 in Oxford, 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 Chris J Ratcliffe - WPA Pool/Getty Images)

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OXFORD, ENGLAND - JULY 14: King Felipe of Spain (C) and Queen Letizia of Spain arrive for a visit to the Weston Library during their State visit to the UK on July 14, 2017 in Oxford, 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 Chris J Ratcliffe - WPA Pool/Getty Images)

OXFORD, ENGLAND - JULY 14: King Felipe of Spain (C) and Queen Letizia of Spain arrive for a visit to the Weston Library during their State visit to the UK on July 14, 2017 in Oxford, 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 Chris J Ratcliffe - WPA Pool/Getty Images)