Peter and Marcellinus are two Roman martyrs who suffered under the Diocletian persecution, about the year 303; the first was a priest, the second an exorcist. Their cultus was so important that after peace was restored to the Church, Constantine built a basilica in their honor, as he did for St. Peter, St. Paul, St. Laurence and St. Agnes. Their names are mentioned in the Canon of the Mass. Erasmus was a bishop in Asia Minor who was martyred in Campania at about the same time. His body was translated to Gaeta in 842. He is often represented with a windlass around which are wound his intestines.