It is hard to give a "conclusive" list since much is constantly in flux, but this is probably enough of a listing. Names in italics are not viewpoint characters.

Titus Valerius Probex. The corrupt and sadistic eminence grise of Britain.
Maria. Wife of Titus Valerius Probex, sister to Catalina.
Catalina. Sister to Maria, guest/prisoner of Probex.
Candidus. Servant to Catalina.
Priscilla. A maid to Catalina.
Nesta. A maid to Catalina.
Quintus Servilius Felis. The deceased husband of Catalina and friend to Probex. An honorable man.
Father Hilarus. Maria’s confessor, and an informer for Probex. Attracted to Probex?
Gaius Atrebas Commodus. Military Count of Britannia. Commander of a legion recently arrived in Britain.
Diantha. A widow exiled to Britain for scandalous behavior.
Gratilla Vitruvia Scapula. Cousin to Diantha.
Marcus Aurelius Decius. Diantha’s former lover, who abandoned her to stay in Rome.
Father Gilbert. Diantha’s confessor… for now.
Father Ioannes. Priest at the same church as Father Gilbert. Attracted to men.
Sulla Atrebas. Count of the Saxon Shore. Local Roman commander near Exeter. Husband to Dionysia. Half-brother to Arvandus.
Dionysia, the pregnant wife of Sulla Atrebas.
Quintilius Scipio. Tribune newly arrived in Britain.
Gadeon. The Clan Chief of the Dumnonii.
Demelza of the Dumnonii. Wife of Gadeon.
Arvandus of the Dumnonii. A War Chief, second only to Gadeon. Half-brother to Sulla Atrbas.
Gilmore of the Dumnonii. A War Chief. Missing his pants.
Faeona of the Dumnonii. Illegitimate daughter of Maleena of the Dumnonii and a Roman soldier.
Maleena of the Dumnonii. A prostitute and the mother of Faeona.