Carus (Marcus Aurelius Carus) kâr´əs [key], 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.

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