The Imperial College 284 - 337

 

Date

East

West

 

Notes

Augustus

Caesar

Augustus

Caesar

20 November 284

Diocletian becomes Augustus, defeats Carinus in 285

Diocletian appears

21 July 285

Maximian named Caesar

Diocletian finds help

1 April 286

Diocletian

Maximian

Empire divided

1 March 293

Diocletian

Galerius

Maximian

Constantius

Caesars chosen

1 May 305

Galerius

Maximinus (Daia)

Constantius

Severus

Abdication of Diocletian and Maximian

25 July 306

Galerius

Maximinus (Daia)

Severus (Constantine)

Constantine

Constantius dies; Constantine called Augustus by troops, but Caesar by Galerius (senior emperor); accepts latter

28 October 306

Galerius

Maximinus (Daia)

Severus
(Constantine)
[Maxentius]
[Maximian]

Constantine

Maxentius named emperor at Rome; Maximian becomes emperor again

spring 307

Galerius

Maximinus (Daia)

Maximian, Maxentius, Constantine

Severus abdicates, Maximian names Constantine Augustus; arrangement not accepted by Galerius

11 November 308

Galerius, Licinius

Maximinus (Daia)

Maximian, Maxentius, Constantine

Licinius named emperor in East

early 309

Galerius, Licinius
Maximinus (Daia)

Maximian, Maxentius, Constantine

too many emperors! Maximinus and Constantine called filii Augustorum in East, Constantine called Augustus in West

July 310

Galerius, Licinius
Maximinus (Daia)

Maxentius, Constantine

Maximian commits suicide

310

Galerius, Licinius, Maximinus (Daia)

Maxentius, Constantine

troops name Maximinus Augustus, Constantine called Augustus in the East

April/May 311

Licinius, Maximinus (Daia)

Maxentius, Constantine

Galerius dies

November 312

Licinius, Maximinus (Daia)

Constantine

Constantine defeats Maxentius 28 October 312, named senior emperor by Senate

July 313

Licinius

Constantine

Maximinus dies

winter 316/7

Licinius, Valens

Constantine

Valens Augustus in Dacia, soon deposed

1 March 317

Licinius

Licinius Jr.

Constantine

Crispus, Constantinus

Licinius and Constantine name sons Caesars

summer 324

Licinius, Martianus

Licinius Jr.

Constantine

Crispus, Constantinus

Martianus named Augustus or Caesar by Licinius, deposed by Constantine

19 September 324

Constantine
Crispus, Constantinus

Licinius and son abdicate, lose in battle, executed

8 November 324

Constantine
Crispus, Constantinus, Constantius

Constantius named Caesar

May 326

Constantine
Constantinus, Constantius

Crispus executed

25 December 333

Constantine
Constantinus, Constantius, Constans

Constans named Caesar

18 September 335

Constantine
Constantinus, Constantius, Constans, Dalmatius

Dalmatius (nephew of Constantine) named Caesar

22 May - 9 September 337

Constantinus, Constantius, Constans

death of Constantine - declaration of sons as Augusti; Dalmatius executed

  View a Stemma of These Emperors



Further and detailed treatment of the individuals and the dates may be found in T.D. Barnes, The New Empire of Diocletian and Constantine (Cambridge, Mass., 1982).


© J. Vanderspoel
Last modified February 2014