Chosen 29th pope. Enlarged the catacombs. Reigned at the start of the persecution of Diocletian, and was himself martyred. Legend says that he apostatized, made sacrifice to pagan gods, then repented, and was beheaded, but this story has been discredited.
- Book of Saints, by the Monks of Ramsgate
- Lives of the Saints, by Father Alban Butler
- New Catholic Dictionary
- Our Sunday Visitor’s Encyclopedia of Saints
- Roman Martyrology
- “Pope Saint Marcellinus“. Saints.SQPN.com. 17 August 2013. Web. 13 December 2013. <>