Gaius Flavius Hilaris: Imperial procurator in charge of finance; whose brief includes the silver mines.
Aelia Camilla: The procurator's wife, youngest sister of the senator Camillus Verus and his brother Publius.
Rufrius Vitalis: An ex-centurion of the Second Augustan Legion, living in retirement at Isca Dumnoniorum.
T. Claudius Triferus: (A Briton). Holder of the contract to manage the Imperial silver mine at Vebiodunum in the Mendip Hills.
Cornix: A sadist. Foreman in charge of slaves at the Imperial silver mine.
Simplex: Medical officer to the Second Augustan Legion at Glevum (special interest: surgery).