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Constantine the Great decisively defeated Licinius in the Battle of Chrysopolis, establishing Constantine's sole control over the Roman Empire and ending the Tetrarchy.
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Constantine the Great
Roman emperor from 306 to 337
Constantine I, also known as Constantine the Great, was a Roman emperor from AD 306 to 337 and the first Roman emperor to convert to Christianity. He played a pivotal role in elevating the status of Christianity in Rome, decriminalising Christian practice and ceasing Christian…Source: Wikipedia (CC BY-SA)
Licinius
Roman emperor from 308 to 324
Valerius Licinianus Licinius was Roman emperor from 308 to 324. For most of his reign, he was the colleague and rival of Constantine I, with whom he co-authored the Edict of Milan that granted official toleration to Christians in the Roman Empire. He was finally defeated at the…Source: Wikipedia (CC BY-SA)
Battle of Chrysopolis
Part of the civil wars of the Tetrarchy (324 AD)
The Battle of Chrysopolis was fought on 18 September 324 at Chrysopolis, near Chalcedon, between the two Roman emperors Constantine I and Licinius. The battle was the final encounter between the two emperors. After his navy's defeat in the Battle of the Hellespont, Licinius…Source: Wikipedia (CC BY-SA)
Roman Empire
Roman imperial state and civilization from 27 BC to 476/1453 AD
The Roman Empire ruled the Mediterranean and much of Europe, Western Asia and North Africa. The Romans conquered most of this during the Republic, and it was ruled by emperors following Octavian's assumption of effective sole rule in 27 BC. The western empire collapsed in 476…Source: Wikipedia (CC BY-SA)
Tetrarchy
Roman system of power division among four rulers
The Tetrarchy was the system instituted by Roman emperor Diocletian in 293 AD to govern the ancient Roman Empire by dividing it between two emperors, the augusti, and their junior colleagues and designated successors, the caesares.Source: Wikipedia (CC BY-SA)