In 308AD, Marcellus, a priest in Rome, was elected Pope.  Prior to this,  Emperor  Diocletian persecuted Christians and a new pope couldn’t be elected.  Marcellus reorganized the Church in Rome, insisting that before being readmitted to the Sacraments, they do penance.  This caused civil disorder and Marcellus was exiled.  He died shortly after being exiled, having being Pope for about 18 months.

FEAST DAY- January 16