In the consistory of 3 June 1921, Pope Benedict XV created three new cardinals, including Ratti, who was appointed Archbishop of Milan simultaneously. The pope joked with them, saying, "Well, today I gave you the red hat, but soon it will be white for one of you." After the Vatican celebration, Ratti went to the Benedictine monastery at Monte Cassino for a retreat to prepare spiritually for his new role. He accompanied Milanese pilgrims to Lourdes in August 1921. Ratti received a tumultuous welcome on a visit to his home town Desio, and was enthroned in Milan on 8 September. On 22 January 1922, Pope Benedict XV died unexpectedly of pneumonia.