Macrinus (Marcus Opellius Severus Macrinus) məkrī´nəs [key], 164–218, Roman emperor (217–18). A Moorish officer, prefect of the Praetorian Guard under Caracalla , he was threatened by the emperor's murderous plans. Macrinus therefore had the emperor killed and became the first emperor who was not a senator. He himself lost the favor of the soldiers, who revolted. He was killed, and Heliogabalus succeeded.

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