MADRID, SPAIN - MAY 26: King Felipe VI of Spain (L), Portuguese President Marcelo Rebelo de Sousa (C) and Queen Letizia of Spain attend the Books Fair 2017 at the Retiro Park on May 26, 2017 in Madrid, Spain. (Photo by Carlos Alvarez/Getty Images)
MADRID, SPAIN - MAY 26: King Felipe VI of Spain (L), Portuguese President Marcelo Rebelo de Sousa (C) and Queen Letizia of Spain attend the Books Fair 2017 at the Retiro Park on May 26, 2017 in Madrid, Spain. (Photo by Carlos Alvarez/Getty Images)