Fabius - Fabiola's father. A simple-minded man, Fabius is happy to take life for what its worth. He sees things in a purely temporal light, like many of the men who assisted in the fall of the Roman Empire. Fabius' joy of life is found in gossip, feasts, and revelry.
Since he is not a philosopher at all, Fabiola more regularly turns to Syra and Agnes for guidance. Fabius is described as, "a true specimen of an easy-going Roman, who was determined thoroughly to enjoy this life."
Eurotas - Fulvius' apparent servant who is also from the East and is very devoted to Fulvius. Eurotas is secretly just as wicked, if not more wicked than, Fulvius and supports him in all his schemes. He and Fulvius share many secrets from the past, but Eurotas has a surprising secret all his own which he reveals at the end of the story.
When he and Fulvius have to flee Rome, Eurotas accidentally kills himself in an attempt to kill Fulvius.
Diogenes - The head of the excavators of the catacombs. Diogenes is a melancholy man described as being, "tall and broad-shouldered, as if accustomed to bear burdens...His hair was silver, and hung down at the sides of a large massive head; his features were strongly marked in deep melancholy lines, and though the expression of his countenance was calm, it was solemnly sad. He looked like one who had lived much among the dead and was happiest in their company."
His two sons are Majus and Severus.
Majus - Diogenes' younger son. Majus is a little more upbeat than his brother and father and likes a good joke. He is more of an artist than they are and enjoys talking about the artwork in the catacombs. He paints some of them himself and is also in charge of the inscriptions on the tombs.
Chromatius - A Roman ex-prefect turned Christian. As a man of great feeling, Chromatius feels his past sins deeply and now gives everything he can to the Church in reparation. He offers his home, the Villa of the Palms, as a place of instruction to the converts and raises palm trees in memory of the martyrs.
Chromatius is converted mainly through his wisdom. He knows that he is witnessing the fall of the Roman Empire. He also knows that there must be more beyond this life if men can be corrupted and entire empires crumble. This leads him to the Faith.
He is an old friend of Fabiola's and strongly encourages her to study the works of Christianity to see if popular opinion is true about their beliefs. Fabiola respects Chromatius as a philosopher and his suggestion makes an impression on her.
Cassianus - The Christian school teacher. Cassianus is able to keep his Christianity to himself while encouraging his pupils to seek the truth. He is martyred when Corvinus, one of his past pupils, finds out he is a Christian and rouses the schoolboys to killing their teacher.
St. Polycarp - A priest of Rome. Polycarp acts as instructor of the newly baptized Christians as well as pastor to the Christians living in Rome.
Dionysius - The priest that also acts as a doctor to the Christians.This allows him to be summoned quickly to a deathbed to administer both physical and spiritual aid.
Dionysius is the priest who baptizes and instructs Fabiola and is seen many places throughout the story.
Reparatus - The deacon of a particular region of Rome. In this film, the deacons are in charge of the organization of Church events. Reparatus is met at an event at Agnes' house were Pancratius' fortune is being distributed to the poor.
Tertullus - Prefect of the city and father of Corvinus. Tertullus appears at many of the tortures and executions of the martyrs throughout the story and has taught his son to love watching other people suffer.
Quintinus - husband of Lucina and father of Pancratius. The opening of the mini-series starts with the execution of Quintinus. This is a very important role because this execution sets the tone for the entire mini-series.
After the fall of the Roman Empire, it was important to rebuild what was lost and the Faith of the martyrs helped lay the foundation for the new empire.