and Mechanisms of Clerical Promotion. In Zeitschrift für Antikes Christentum/Journal of Ancient Christianity 21, p. 53-73. (Open access). External links St. Calixtus, or Callistus, Pope, Martyr St. Callistus I Collected works of Migne Patrologia Latina Collected works by Migne Patrologia Latina 223 deaths 3rd-century archbishops 3rd-century Christian martyrs 3rd-century Romans Ancient Christians involved in controversies Burials at Santa Maria in Trastevere Christian slaves and freedmen Papal saints Popes Year of birth unknown 3rd-century popes