•
Glaucus – The
protagonist, a handsome Athenian nobleman and Ione's betrothed. •
Ione – A beautiful and intelligent high-born Greek set to marry Glaucus. Orphaned in childhood, she was Arbaces' ward and becomes the target of his evil attempts at seduction. •
Arbaces – The
antagonist, a scheming
Egyptian sorcerer and a high priest of
Isis, and the former guardian of Ione and Apaecides. Murders Apaecides and frames Glaucus for the crime. Repeatedly attempts to seduce Ione. •
Nydia – A young blind slave stolen from high-born parents by kidnappers in
Thessaly. She weaves and sells garlands of flowers to earn coins for her tyrannical owners, Burbo and Stratonice. Nydia pines for Glaucus and eventually commits suicide rather than suffer unrequited love. •
Apaecides – Ione's brother who is murdered by Arbaces. In the
1984 adaptation, his name is changed to Antonius. • (1840)
Sallust – A good-hearted epicurian and friend of Glaucus. •
Calenus – A greedy priest of the cult of Isis who witnesses Arbaces murder Apaecides. First blackmails Arbaces, then tells the truth when Arbaces turns on him. •
Burbo – Calenus's brother, who robs the
Temple of Isis during the eruption. •
Olinthus – A Christian who converts Apaecides to Christianity. Sentenced to death for his religion. •
Diomed – A rich, dyspeptic merchant known in Pompeii for his lavish banquets. Julia's father. •
Julia – The handsome but spoiled daughter of Diomed. Has eyes for Glaucus and obtains a potion that will make him love her; instead receives a potion that will make him insane. •
Clodius – A spendthrift noble with a gambling problem. Becomes Julia's suitor after she loses interest in Glaucus. •
Lepidus – Another noble, a friend of Glaucus, Sallust, and Clodius. •
The Witch of Vesuvius – The Witch who provides the mental potion for Arbaces. She eventually prophecies danger and flees Pompeii. •
Pansa – An
aedile of Pompeii, based on the historical Pompeiian
Gaius Cuspius Pansa. •
Lydon – A
gladiator who fights in
Pompeii's Amphitheatre to earn money to pay for his father's freedom. •
Medon – A
slave of Diomed, a part of Pompeii's Christian community, Lydon's father. •
Stratonice – Nydia's former mistress who treated her with utmost cruelty; wife of Burbo. ==Plot summary==