Diocletian · Saint George Were Diocletian and Saint George alive at the same time? Yes. Diocletian and Saint George were alive at the same time, from AD 275 to c. AD 303. DiocletianAugustus of the Eastern Roman EmpireBorn 240s · died 3 December AD 316Saint GeorgeChristian saint and martyrBorn AD 275 · died c. AD 303 PlotinusDiocletianConstantine the GreatSaint George Diocletian and Saint George in bold, with some of their best-known contemporaries. Drag across to see the age each reached in any year. Faded ends mark uncertain dates.