Son of Priscus. Chosen 34th pope; he reigned less than a year. Believed to have built the basilica of San Marco in Rome, Italy and the Juxta Pallacinis basilica just outside the city. Issued a constitution confirming the power of the bishop of Ostia to consecrate newly elected popes. Little else is known of his life or reign.
- 7 October 336 at Rome, Italy of natural causes
- buried in the catacomb of Balbina, where he had built the cemetery church
- “Pope Saint Mark“. CatholicSaints.Info. 18 October 2008. Web. 23 May 2015. <>