- 27 BC - Octavian given the name Augustus.
- 27-19 BC - Agrippa completes conquest of northwest Spain.
- 9 AD - disaster in Germany - Rhine becomes the frontier.
- 43 AD - invasion of Britain.
- 66-73 AD - Jewish revolt.
- 69 AD - Year of Four Emperors
- 69-92 AD - Flavian dynasty
- 79 AD - Eruption of Vesuvius; destruction of Pompeii.
- 92-192 AD - Antonine era
- 101-6 AD - Trajan conquers Dacia
- 113 AD - Trajan's Forum & Column dedicated
- 148 AD - 900th anniversary of the foundation of Rome (900 AUC)
- 162-5 AD - Parthian wars of L. Verus.
- 165-7 AD - plague spreads throughout the Empire.
- 168-175 AD - German wars of Marcus Aurelius.
- 192 AD - murder of Commodus - four emperors
- 193-235 AD - Severan dynasty
- 235-284 AD - years of military anarchy
- 284 AD - Diocletian restablishes central power, establishes Tetrarchy.
- 306-327 AD Constantine the Great
- 312 AD - Battle of Milvian Bridge, Christianity becomes state reglion.
- 324 AD - foundation of Constantinople (Byzantium) by Constantine.