Kammala jumla mai zuwa: Mistrangelo daga baya ya zama babban bishop na Florence a ranar 19 ga Yuni 1899, kuma ya yi aiki a matsayin babban janar na Piarists daga 1900 zuwa 1904 kuma. Paparoma Benedict XV ya sanya shi babban firist-firist na S. Maria degli Angeli a cikin babban taron ranar 6 ga Disamba, 1915. Ya kasance daya daga cikin cardinal masu zabe wanda ya halarci
1922 papal conclave, wanda ya zaɓi Paparoma Pius XI.