Didius Julianus (Marcus Didius Salvius Julianus) dĭ´dēəs jo͞olēā´nəs [key], d. 193, Roman emperor (193). He was consul under Pertinax , on whose death the Praetorian Guard received bids for the position of emperor. Didius bid highest and became emperor. Two months later he was murdered when Septimius Severus , who would not recognize him, bought the support of the Praetorian Guard. Severus succeeded him.
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