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| 0282 | Birth |  |
| 17th Feb Naissus Birth of Constantine I the Great, eldest son of Constantius I
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| 0293 | Tribune |  |
| Appointed Tribune
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| Rome Appointed Tribune
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| 0296 | Invasion of Britain |  |
| Recovers Britain from the usurper Allectus, an officer in Carasius' army
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| Rome Recovers Britain from the usurper Allectus, an officer in Carasius' army
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| 0296 | Invasion of Egypt |  |
| Accompanies Diocletian on an expedition to Egypt
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| Rome Accompanies Diocletian on an expedition to Egypt
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| 0296 | Rebellion |  |
| London Constantine I the Great defeats Allectus & enters London
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| 0306 | Succession |  |
| Rules alongside Maxentius
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| Rome Rules alongside Maxentius
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| Succeeds as Emperor of Rome
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| Rome Succeeds as Emperor of Rome
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| 25th July York Son of Constantius who dies by his side in York & then acclaimed Emperor by his troops
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| 0307 | Rule of Britain |  |
| 11th Nov Succeeds as Emperor, only has effective rule of Britain & Gaul
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| 11th Nov Rome Succeeds as Emperor, only has effective rule of Britain & Gaul
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| 0307 | Rule of Gaul |  |
| 11th Nov Succeeds as Emperor, only has effective rule of Britain & Gaul
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| 0307 | Succession |  |
| 11th Nov Succeeds as Emperor, only has effective rule of Britain & Gaul
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| 11th Nov Rome Succeeds as Emperor, only has effective rule of Britain & Gaul
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| 0312 | Battle of Milvian Brid |  |
| 28th Oct Milvian Brid Defeats Maxentius & makes himself Master of the Roman Western Empire
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| 0312 | Battle of Saxa Rubra |  |
| 28th Oct Saxa Rubra Constantine defeats the rebel legions of Maxentius
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| 0312 | Conversion |  |
| Claims to see the cross of Jesus & hear the words "In this sign conquer"
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| Rome Claims to see the cross of Jesus & hear the words "In this sign conquer"
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| 0312 | Reform |  |
| Introduces the Siliqua, a silver coin serving as the basis of a reorganized currency
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| Rome Introduces the Siliqua, a silver coin serving as the basis of a reorganized currency
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| 0313 | Edict Milan |  |
| Milan Religious freedom & equality for Christianity
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| Milan Return of Church property & elimination of cults of the state
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| 0314 | Battle of Mardia |  |
| 3rd July Mardia As a result of the battle captures Ilyricum & Greece & retains Asia, Egypt & Thrace
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| 3rd July Mardia Defeats Licinius forcing him to sue for peace
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| 0314 | Council Arles |  |
| Arles Summons Bishops of the western world to the Council of Arles
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| 0314 | Rule of Balkans |  |
| 8th Oct Balkans Defeats Licinius, his co-emperor, who loses most of the Balkans
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| 0314 | Rule of Egypt |  |
| 3rd July After wining the Battle of Mardia Constantine retains his rule over Egypt
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| 0314 | Rule of Greece |  |
| 3rd July After wining the battle of Mardia Constantine extends his rule over Greece
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| 0314 | Rule of Llyricum |  |
| 3rd July Llyricum After wining the Battle of Mardia Constantine extends his rule over Llyicum
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| 0314 | Rule of Thrace |  |
| 3rd July Thrace After wining the Battle of Mardia Constantine extends his rule over Thrace
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| 0315 | Arch of Constantine |  |
| Completes the arch of Constantine in Rome
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| Rome Completes the arch of Constantine in Rome
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| 0321 | Observance Sundays |  |
| 3rd July Makes Sunday a day of rest throughout the Empire
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| 3rd July Rome Makes Sunday a day of rest throughout the Empire
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| 0322 | Declaration of War |  |
| Constantine persues a defeated army of Goths into Licinius' territory & war resumes
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| 0323 | Battle of Adrianople |  |
| 3rd July Adrianople Leads the frontal attack & defeats Licinius who flees to Byzantium
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| 0323 | Battle of Chrysopolis |  |
| 18th Sep Chrysopolis Defeats Licinius who later surrenders & is executed
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| 0324 | Battle of Adrianople |  |
| 3rd July Adrianople Constantine defeats Licinius & unites the 2 halves of the Empire under his sole rule
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| 0324 | Battle of Chrysopolis |  |
| July Chrysopolis Constantine defeats Licinius during a naval battle after the battle of Adrianople
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| 0324 | Execution |  |
| After the execution of Licinius rules as the only Emperor of Rome
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| Rome After the execution of Licinius rules as the only Emperor of Rome
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| 0324 | Succession |  |
| After the execution of Licinius rules as the only Emperor of Rome
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| Rome After the execution of Licinius rules as the only Emperor of Rome
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| Succeeds as Emperor of Rome
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| Rome Succeeds as Emperor of Rome
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| 0325 | Council Nicea |  |
| Nicea Christ & God are declared of the same substance, "consubstantial"
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| Nicea Establishes an orthodox creed
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| Nicea Presides over the 1st General Council of the Church of Nicea
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| 0325 | Death |  |
| Defeats & executes Licinius then rules the Roman Empire as the sole Emperor
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| 0325 | Execution |  |
| Defeats & executes Licinius then rules the Roman Empire as the sole Emperor
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| 0326 | Succession |  |
| 25th July Constantine celebrates 20 years in power & his triumphs over the barbarians & Licinius
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| 25th July Rome Constantine celebrates 20 years in power & his triumphs over the barbarians & Licinius
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| 0330 | Constantinople |  |
| 11th May Constantinople Byzantium is renamed Constantinople & made the Christian capital
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| 11th May Constantinople Constantinople becomes a 2nd Rome in an effort to unite the east & west of the Empire
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| 0331 | Siege of Temples |  |
| Confiscates all treasures of the pagan temples throughout the Empire
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| Rome Confiscates all treasures of the pagan temples throughout the Empire
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| 0335 | Consecration |  |
| Jerusalem The Church of the Holy Sepulchre is consecrated
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| 0337 | Baptism |  |
| Nicomedia Constantine I the Great is baptised on his deathbed by Bishop Eusebius of Nicomedia
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| 0337 | Consecration |  |
| Jersusalem Celebrates 30 yrs in power by consecrating the Holy Sepulchre
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| 0337 | Death |  |
| 22nd May Nicomedia Death of Constantine I the Great, in his villa near Ancyra in Nicomedia
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| 0337 | Mobilization |  |
| Mobilizes an army during the winter in preparation for invasion by Shapur II
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| 0337 | Roman Catholic Church |  |
| Constantinople Makes preparations for his tomb in the Church of the Holy Apostles s
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| 0337 | Succession |  |
| Succeeded by 3 sons, Constantine II, Constantius II & Constans
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| 0337 | Synod |  |
| Tyre Calls up a synod to "free the Church from blasphemy & lighten my cares"
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