Carus, in full Marcus Aurelius Carus, (died 283), Roman emperor 282–283.

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Carus was probably from either Gaul or Illyricum and had served as prefect of the guard to the emperor Probus (276–282), whom he succeeded. Like his predecessors, Carus adopted the name Marcus Aurelius as a part of his imperial title. After a brief Danube campaign he led his troops against the Sāsānians, penetrating beyond the Tigris, where he died suddenly and mysteriously, allegedly struck by lightning. His sons Numerian and Carinus succeeded him.