Generally accepted as the one mentioned by Livy, it lies beneath the church of San Giuseppe dei Falegnami, Via di Marforio, Rome, Italy. According to tradition in the 6th-century Acts of Saint Processus and Saint Martmlanus, Saint Peter the Apostle was imprisoned in the lower chamber or Tullianum where he baptized these saints, his jailers.
- “Mamertine Prison”. . CatholicSaints.Info. 26 June 2010. Web. 29 November 2015. <http://catholicsaints.info/mamertine-prison/>