Pope Marcellus I (died 309) was the Bishop of Rome or
Pope from May or June 308 to his death in 309. He succeeded
Pope Marcellinus after a considerable interval. Under
Maxentius, he was banished from
Rome in 309, on account of the tumult caused by the severity of the penances he had imposed on Christians who had lapsed under the recent persecution. He died the same year, being succeeded by
Pope Eusebius. His relics are under the altar of
San Marcello al Corso in Rome. His third-class
feast day is kept on January 16.