Julius Placidianus (fl. 269–273) was a Roman general of the 3rd century. He was a professional soldier who advanced his career under Gallienus and survived into the age of Claudius II and Aurelian. Placidianus was consul in the year 273 as the posterior colleague of Marcus Claudius Tacitus, the future emperor.[1] His life presented here is largely derived from L.L. Howe's history of the Praetorian Prefecture.[2]