VATICAN CITY, VATICAN - JUNE 22: Prefect of the Apostolic Library Ambrogio Piazzoni (C) showes an old book to King Willem-Alexander of the Netherlands and Queen Maxima during a visit at the Vatican Library on June 22, 2017 in Vatican City, Vatican. King Willem-Alexander and Queen Maxima are in Italy for a four days visit. (Photo by Vatican Pool/Getty Images)
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