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MADRID, SPAIN - MARCH 11: King Felipe VI of Spain and Queen Letizia of Spain attend the opening of 'Teresa de Jesus' exhibition at the National Library on March 11, 2015 in Madrid, Spain. (Photo by Raul Martinez - Pool/Getty Images)

MADRID, SPAIN - MARCH 11:  King Felipe VI of Spain and Queen Letizia of Spain attend the opening of 'Teresa de Jesus' exhibition at the National Library on March 11, 2015 in Madrid, Spain.  (Photo by Raul Martinez - Pool/Getty Images)