(Latin: semtus, the sixth)
Reigned from August 30, 257 to August 6, 258. Martyred in Rome on August 6, 258. Although, like his predecessors, he upheld the Roman usage of not rebaptizing heretics, he reconciled the Churches of Africa and Asia Minor who were nearing a schism on the subject. He fell under the edict of Valerian which condemned to deathall bishops, priests, and deacons; his name occurs in the prayer Communicantes in the Canon of the Mass. Feast, Roman Calendar, August 7,.