Carus (Marcus Aurelius Carus) (kâr´əs), d. 283, Roman emperor (282–83). Praetorian prefect under Probus, he was made emperor by the soldiers after the murder of Probus. Leaving his son Carinus in command of the West, Carus and another son, Numerianus, went on a campaign in the East. He defeated the Sarmatians, successfully attacked the Parthians, and took Ctesiphon. Soon afterward he died mysteriously.