Roman Empire -- fiction
Gaius Petrius Ruso has just arrived for duty in the Britain, a far backwater of the Roman Empire. He’s been assigned to the Valeria Victrix Legion as Medicus, serving the legion and the natives living in the town surrounding the barracks. When the only other doctor on staff is poisoned by a plate of oysters at the local bar/bordello, Ruso works on alone. Tramping the town in an exhausted stupor, he encounters an odious merchant beating an unconscious slave girl—who clearly has a badly broken arm.