Rubuta ci gaba don wannan sakin layi - An daukaka Cardinal Vicar zuwa Cardinal Bishop na Velletri-Segni a ranar 22 ga Maris, 1917, kuma yana ɗaya daga cikin Cardinal masu zaɓe a wani taro, na 1922
, wanda ya haifar da zaben Paparoma Pius XI. A shekara ta 1923, ya yi musayar ziyara tare da Filippo Cremonesi, wani kwamishinan sarauta, wanda ya zama magajin gari na Roma daga 1922 zuwa 1926. Daga cikin sauran abubuwan da suka faru, Pompili ya yi aiki a matsayin wakili na papal zuwa buɗe (24 Disamba 1924) da rufe (24 Disamba 1925) na ƙofar mai tsarki a Lateran Basilica. A ranar 9 ga Yuli, 1930, an sanya shi Mataimakin Dekan na Kwalejin Cardinals, ya kasance a wannan matsayin har zuwa mutuwarsa.