(Sergius III is referred to as Sergius for the times before he became pope.)

(Stephen VIII was numbered as Stephen IX from sometime in 16th century to 1961.)

(John XIX is referred by his baptismal name for the times before he became pope.)

(Leo IX is referred by his baptismal name for the times before he became pope.)

(Victor III is referred by his baptismal name for the times before he became pope.)

(Paschal II is referred by his baptismal name for the times before he became pope.)

(Gelasius II is referred by his baptismal name for the times before he became pope.)