314 EMPERORS
Diadumenianus (Imp. Caesar M. Opellius Antoninus
Diadumenianus Augustus) 218
Elagabal (Imp. Caesar M. Aurelius Antoninus Augustus) 218–222
Severus Alexander (Imp. Caesar M. Aurelius Severus
Alexander Augustus) 222–235
Some later emperors referred to in the text
Maximinus (Imp. Caesar C. Julius Verus Maximinus Augustus) 235–238
Philip (Imp. Caesar M. Julius Philippus Augustus) 244–249
Decius (Imp. Caesar C. Messius Quintus Traianus Decius
Augustus) 249–251
Valerian (Imp. Caesar P. Licinius Valerianus Augustus) 253–260
Gallienus (Imp. Caesar P. Licinius Egnatius Gallienus
Augustus) 253–268
Aurelian (Imp. Caesar Domitius Aurelianus Augustus) 270–275
Diocletian (Imp. Caesar C. Aurelius Valerius Diocletianus
Augustus) 284–305
Constantine (Imp. Caesar Flavius Valerius Constantinus
Augustus) 307–337