Marcellus, a Christian centurion or captain in the legion of Trajan, then posted in Spain, not to defile himself with taking part in those impious abominations, left his company, declaring aloud that he was a soldier of Jesus Christ, the eternal King. He was at once committed to prison.
When the festival was over, Marcellus was brought before a judge, and, having declared his faith, was sent under a strong guard to Aurelian Agricolaus, vicar to the prefect of the praetorium, who passed sentence of death upon him. St. Marcellus was forthwith led to execution, and beheaded on the 30th of October.
Cassian, the secretary or notary of the court, refused to write the sentence pronounced against the martyr, because it was unjust. He was immediately hurried to prison, and was beheaded, about a month after, on the 3rd of December.
Feast Day of Saint Marcellus
The Feast Day of Saint Marcellus is October 30. The origin of Feast Days: most saints have specially designated feast days and are associated with a specific day of the year and these are referred to as the saint's feast day.
The feast days first arose from the very early Christian custom of the annual commemoration of martyrs on the dates of their deaths at the same time celebrating their birth into heaven.