|Date of Birth:||Unknown|
|Cause of Death||Impaled by a metal rod, courtesy of Lucius.|
Father Dicosimo is a priest of the Winter Hill diocese and the colleague of Lagel. Dicosimo first appears alongside Lagel when they try to gain entry to the Wagner estate and are thrown out by Fabius. He and Lagel are last met by Lucius in their attempt to exorcise him in chapter 18.