Three Popes are hidden in this 1952 document. Can you identify them? 🔎 Pope Pius XII issued it 🔎 Angelo Roncalli became Pope John XXIII 🔎 Signatory Giovanni Battista Montini became Pope Paul VI One letter, three Popes, and a great start of UNESCO history. Ahead of #PopeLeoXIV @Pontifex's visit to UNESCO on 25 September, discover more stories from UNESCO’s archives:unesco.org/en/pope-leoxiv-un… @HolySeeatUNESCO