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| 0317 | Birth |  |
| Birth of Constantius II, son of Constantine the Great |
| Rome Birth of Constantius II, son of Constantine the Great |
| 0324 | Caesar | |
| Appointed Caesar, junior Emperor |
| Rome Appointed Caesar, junior Emperor |
| 0333 | Rule of Antioch | |
| Antioch Given Antioch to administer |
| 0333 | Succession | |
| Succeeds as Emperor of Rome, joint Empeor 337-350 |
| Rome Succeeds as Emperor of Rome, joint Empeor 337-350 |
| 0335 | Rule of Eastern Empire | |
| Succeeds as Emperor of the Eastern Roman Empire |
| Rome Succeeds as Emperor of the Eastern Roman Empire |
| 0337 | Assassination | |
| Sep Constantius II's brother Delmatius is assassinated |
| Sep Constantius II's brother Julius Constantius is assassinated |
| Sep Constantius II's friend Flavius Optatus is assassinated |
| Sep Constantius II's friend Popilius Nepotianus is assassinated |
| 0337 | Burial | |
| Iona Leads his father's funeral procession |
| 0337 | Rule of Egypt | |
| Becomes ruler of Thrace, Macedonia, Greece, Asia & Egypt after Constantine's death |
| 0337 | Rule of Greece | |
| Becomes ruler of Thrace, Macedonia, Greece, Asia & Egypt after Constantine's death |
| 0337 | Rule of Macedonia | |
| Becomes ruler of Thrace, Macedonia, Greece, Asia & Egypt after Constantine's death |
| 0337 | Rule of Thrace | |
| Thrace Becomes ruler of Thrace, Macedonia, Greece, Asia & Egypt after Constantine's death |
| 0337 | Succession | |
| After his father's death plays a part in killing members of the imperial family |
| Shares the Empire with his brothers Constans & Constantine II |
| Succeeds as Emperor of Rome, in the East |
| 9th Sep Constantius II & his 2 brothers are acclaimed as Augusti |
| 0340 | Constitution | |
| The triple rule of the Empire ends when Constantine II dies |
| 0340 | Rule of Empire | |
| Aquileia The Empire splits into the East under Constantius II & the West under Constans |
| 0350 | Succession | |
| Defeats Magnentius & becomes the sole ruler of the Empire |
| Rome Defeats Magnentius & becomes the sole ruler of the Empire |
| 0351 | Battle of Danube | |
| River Danube Defeats his major rival Magnentius in battle |
| 0351 | Battle of Mursa | |
| Mursa Magnentius is defeated by Constantius |
| 0352 | Closure Temples | |
| Closes all pagan temples |
| 0353 | Death | |
| Death of Magnentius , falls on his own sword |
| 0353 | Succession | |
| Becomes undisputed ruler of the whole Roman Empire |
| Rome Becomes undisputed ruler of the whole Roman Empire |
| 0354 | Execution of Gallus | |
| Constantius II becomes undisputed ruler of the Roman Empire |
| Rome Constantius II becomes undisputed ruler of the Roman Empire |
| Has his Caesar executed then appoints Gallus ' half brother Julian to be Caesar |
| Rome Has his Caesar executed then appoints Gallus ' half brother Julian to be Caesar |
| 0355 | Rebellion | |
| Silvanus is killed when Constantius sends Ursucimus to put down the rebellion |
| 0355 | Succession | |
| Constantius II appoints his 23 yr old cousin Julian the Apostate as joint Casar |
| 0359 | Rule of Mesopotamia | |
| Mesopotamia Succesfully attacks Mesopotamia |
| 0361 | Death | |
| 3rd Nov Tarsus Death of Constantius II, dies near Tarsus in Galicia |
