| Historical Event | Roman Emperor | Year |
| Varus is defeated at the Battle of the Teutoburg Forest | |
| Britain is brought under Roman rule | |
| Mt. Vesuvius erupts, destroying Herculaneum and Pompeii | |
| The Kingdom of Dacia is conquered and a province is added to the Empire | |
| A wall is erected across the northern frontier of Britannia | |
| A great plague is brought from the East, and decimates the population of the Empire | |
| The office of Emperor is purchased in an auction held by the Praetorian Guard | |
| The Constitutio Antoniniana is issued, conferring citizenship on all free men in the Empire | |
| Queen Zenobia of the Kingdom of Palmyra is defeated | |
| The Tetrarchy of Rome is founded | |
| Battle of the Milvian Bridge is won | |
| The Battle of Adrianople is lost, and this emperor is killed in battle | |