Caterina Landriani is a vampire of Rome who used and manipulated a young Walter Stanford to gather information on Vatican activities. Once Walter was introduced to the hunter org Society of Leopold, she mind-controlled him to bring his mentor, Father Francis Olsmont, to her. She murdered Father Olsmont but was unable to kill Walter as well. Through this experience, Father Walter rose in the witch-hunter ranks but was never able to find and destroy Caterina.