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”. . Saints.SQPN.com. 26 June 2010. Web. 20 September 2014. <http://saints.sqpn.com/mamertine-prison/>