From the Beginning of the Empire to the Division into East and West in 384 A.D.
| Emperor | Date |
| |
| Augustus | 27 B.C. — 14 A.D. |
| Tiberius | 14 — 37 A.D. |
| Gaius (Caliguia) | 37 — 41 |
| Claudius | 41 — 54 |
| Nero | 54 — 68 |
| Galba | 68 — 69 |
| Otho | 69 |
| Vitellius | 69 |
| Vespasian | 69 — 79 |
| Titus | 79 — 81 |
| Domitian | 81 — 96 |
| Nerva | 96 — 98 |
| Trajan | 98 — 117 |
| Hadrian | 117 — 138 |
| Antoninus Pius | 138 — 161 |
| Marcus Aurelius | 161 — 180 |
| Commodus | 180 — 192 |
| Pertinax, etc. | 193 |
| Septimius Severus | 193 — 211 |
| Caracalla and Geta | 211 — 212 |
| Caracalla alone | 212 — 217 |
| Macrinus | 217 — 218 |
| Elagabalus | 218 — 222 |
| Alexander Severus | 222 — 235 |
| Maximinus Thrax | 235 — 238 |
| Gordianus I, II, etc. | 238 |
| Gordianus III | 238 — 244 |
| Philippus Arabs | 244 — 249 |
| Decius | 249 — 251 |
| Gallus and Volusianus | 251 — 253 |
| Aemilianus | 253 |
| Valerian | 253 — 260 |
| Gallien | 260 — 268 |
| Claudius II, etc. | 268 — 270 |
| Aurelianus | 270 — 275 |
| Tacitus, etc. | 275 — 276 |
| Probus, etc., etc. | 276 — 284 |
| Diocletian | 284 — 305 |
| Maximian | 286 — 305 |
| Galerius and Constantius Chlorus | 293 |
| Galerius and Constantius succeed as Augusti; Maximinus Daia and Severus become Caesars | 305 |
| Constantius dies; Constantine becomes Caesar in West; Maxentius supplants Severus in Italy | 306 |
| Licinius made Caesar, and later Augustus by Galerius | 307 |
| Constantin assumes title of Augustus | 307 |
| Maximinus Daia becomes Augustus(?) | 309 |
| Death of Galerius | 311 |
| Macentius defeated by Constantin at Milvian Bridge and slain | 312 |
| Edict of Mediolanum issued by Constantin and Licinius | 313 (January) |
| Maximinus Daia, defeated by Licinius, kills himself | 313 |
| Constantin sole emperor after defeat and death of Licinius | 323 — 337 |
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