State criminals were held in this prison, among them some Christians. Watching the Christian prisoners and listening to their preaching, Processus and Martinian gradually came to the knowledge of the Savior. When the holy Apostle Peter was locked up at the Mamertine prison, Processus and Martinian came to believe in Christ. They accepted holy Baptism from the apostle and released him from prison.
The jailer Paulinus learned about this, and he demanded that Saints Processus and Martinian renounce Christ. But they fearlessly confessed Christ, and they spat at the golden statue of Jupiter. Paulinus ordered that they be slapped on the face, and then seeing the resolute stance of the holy martyrs, he subjected them to torture. The martyrs were beaten with iron rods, scorched with fire, and finally, thrown into prison.
A certain illustrious and pious woman, by the name of Lucina, visited them in prison and gave them help and encouragement. The torturer Paulinus was soon punished by God. He fell blind and died three days later. The son of Paulinus went to the city ruler demanding that the martyrs be put to death. Saints Processus and Martinian were beheaded by the sword (+ ca. 67).
Lucina buried the bodies of the martyrs. Today their tomb is in the south transept of Saint Peter’s Basilica in Rome.