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Emperors from Augustus to Constantine

Emperor Reign
Augustus (Imp. Caesar Augustus) 27 BC-AD 14
Tiberius (Ti. Caesar Augustus) AD 14-37
Gaius / Caligula (C. Caesar Augustus Germanicus) 37-41
Claudius (Ti. Claudius Caesar Augustus Germanicus) 41-54
Nero (Imp. Nero Claudius Caesar Augustus Germanicus) 54-68
Galba (Ser. Sulpicius Galba Imp. Caesar Augustus) 68-69
Otho (Imp. M. Otho Caesar Augustus) 69
Vitellius (A. Vitellius Augustus Germanicus Imp.) 69
Vespasian (Imp. Caesar Vespasianus Augustus) 69-79
Titus (Imp. Titus Caesar Vespasianus Augustus) 79-81
Domitian (Imp. Caesar Domitianus Augustus) 81-96
Nerva (Imp. Caesar Nerva Augustus) 96-98
Trajan (Imp. Caesar Nerva Traianus Augustus) 98-117
Hadrian (Imp. Caesar Traianus Hadrianus Augustus) 117-138
Antoninus Pius (Imp. Caesar T. Aelius Hadrianus Antoninus Augustus Pius) 138-161
Marcus Aurelius (Imp. Caesar M. Aurelius Antoninus Augustus) 161-180
Lucius Verus (Imp. Caesar L. Aurelius Verus Augustus) 161-169
Commodus (Imp. Caesar M. Aurelius Commodus Antoninus Augustus) 176-192
Pertinax (Imp. Caesar P. Helvius Pertinax Augustus) 193
Didius Julianus (Imp. Caesar M. Didius Severus Julianus Augustus) 193
Septimius Severus (Imp. Caesar L. Septimius Severus Pertinax Augustus) 193-211
Clodius Albinus (Imp. Caesar D. Clodius Septimius Albinus Augustus) 193-197
Pescennius Niger (Imp. Caesar C. Pescennius Niger Justus Augustus) 193-194
Caracalla (Imp. Caesar M. Aurelius Antoninus Augustus) 198-217
Geta (Imp. Caesar P. Septimius Geta Augustus) 209-211
Macrinus (Imp. Caesar M. Opellius Macrinus Augustus) 217-218
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
Maximinus (Imp. Caesar C. Julius Verus Maximinus Augustus) 235-238
Gordian I (Imp. Caesar M. Antonius Gordianus Sempronianus Romanus Africanus Senior Augustus) 238
Gordian II (Imp. Caesar M. Antonius Gordianus Sempronianus Africanus Iunior Augustus) 238
Balbinus (Imp. Caesar D. Caelius Calvinus Balbinus Augustus) 238
Pupienus (Imp. Caesar M. Clodius Pupienus Augustus) 238
Gordian III (Imp. Caesar M. Antonius Gordianus Augustus) 238-244
Philip (Imp. Caesar M. Julius Philippus Augustus) 244-249
Decius (Imp. Caesar C. Messius Quintus Traianus Decius Augustus) 249-251
Trebonianus Gallus (Imp. Caesar C. Vibius Trebonianus Gallus Augustus) 251-253
Volusianus (Imp. Caesar C. Vibius Afinius Gallus Veldumianus Volusianus Augustus) 251-253
Aemilianus (Imp. Caesar M. Aemilius Aemilianus Augustus) 253
Valerian (Imp. Caesar P. Licinius Valerianus Augustus) 253-260
Gallienus (Imp. Caesar P. Licinius Egnatius Gallienus Augustus) 253-268
Claudius II (Imp. Caesar M. Aurelius Claudius Augustus) 268-270
Quintillus (Imp. Caesar M. Aurelius Claudius Quintillus Augustus) 270
Aurelian (Imp. Caesar Domitius Aurelianus Augustus) 270-275
Tacitus (Imp. Caesar M. Claudius Tacitus Augustus) 275-276
Florianus (Imp. Caesar M. Annius Florianus Augustus) 276
Probus (Imp. Caesar M. Aurelius Probus Augustus) 276-282
Carus (Imp. Caesar M. Aurelius Carus Augustus) 282-283
Carinus (Imp. Caesar M. Aurelius Carinus Augustus) 283-285
Numerianus (Imp. Caesar M. Aurelius Numerius Numerianus Augustus) 283-284
Diocletian (Imp. Caesar C. Aurelius Valerius Diocletianus Augustus) 284-305
Maximian (Imp. Caesar M. Aurelius Valerius Maximianus Augustus) 286-305
Constantius (Imp. Caesar Flavius Valerius Constantius Augustus) 305-306
Galerius (Imp. Caesar C. Galerius Valerius Maximianus Augustus) 305-311
Severus (Flavius Valerius Severus Augustus) 306-307
Maxentius (M. Aurelius Valerius Maxentius Augustus) 306-312
Constantine (Imp. Caesar Flavius Valerius Constantinus Augustus) 307-337
Licinius (Imp. Caesar Valerius Licinianus Licinius Augustus) 308-324
Maximin (C. Valerius Galerius Maximinus Augustus) 308/9-313

Emperors from Diocletian to Romulus

A.= Augustus; C. = Caesar.
Emperor WestReignEmperor EastReign
MaximianC. 285-286, A. 286-305, 307-310DiocletianA. 284-305
Constantius IC. 293-305, A. 305-306GaleriusC. 293-305, A. 305-311
ConstantineC. 306-308, A. 308-337MaximinC. 305-308, A. 308-313
SeverusA. 306-307  
MaxentiusA. 307-312LiciniusA. 308-324
  LicinianusC. 317-323
CrispusC. 317-325MartinianusC. 324
  ConstantineA. 324-337
Constantine IIC. 317-337, A. 337-340Constantius IIC. 324-337, A. 337-361
ConstansC. 333-337, A. 337-350  
DalmatiusC. 335-337GallusC. 350-354
Constantius IIA. 351-361  
JulianC. 355-360, A. 360-363Julian A. 361-363
JovianA. 363-364JovianA. 363-364
Valentinian IA. 364-375ValensA. 364-378
GratianA. 375-383  
MaximusA. 383-387Theodosius IA. 379-395
Valentinian IIA. 383-392  
Theodosius IA. 394-395  
HonoriusA. 395-423ArcadiusA. 395-408
Constantius IIIA. 421Theodosius IIA. 408-450
Valentinian IIIA. 425-455MarcianA. 450-457
Petronius MaximusA. 455  
AvitusA. 455-456  
MajorianA. 457-461Leo I A. 457-474
Libius SeverusA. 461-465  
AnthemiusA. 467-472  
OlybriusA. 472  
GlyceriusA. 473  
Julius NeposA. 473-480Leo IIA. 474
RomulusA. 475-476ZenoA. 474-491
  AnastasiusA. 491-518
  Justin IA. 518-527
  JustinianA. 527-565
  Justin IIA. 565-578
  Tiberius Constantine C. 574-578, A. 578-582
  MauriceA. 582-602