On This Day

Battle of Adrianople: Roman Emperor Constantine I defeats his co-emperor Licinius, who flees to Byzantium

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...

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 Battle of Chrysopolis (AD 324), and was later executed on the orders of Constantine.

Historical Significance

Valerius Licinianus Licinius was Roman emperor from 308 to 324.

Key People

Constantine the Great

Roman emperor from 306 to 337

Roman emperor from 306 to 337

Events Before

  1. St Silvester I begins his reign as Catholic Pope

    St Silvester I begins his reign as Catholic Pope

  2. BC Battle of Crannon between Athens and Macedon following the death of Alexander the Great

    The Battle of the Echinades was one of the naval battles of the Lamian War (323–322 BC), fought between the Macedonian navy under Cleitus the White and the Athenian navy.

Events After

  1. Old St. Peter's Basilica consecrated in Rome (stood 4th - 16th century), later replaced by current Basilica

    Old St. Peter's Basilica consecrated in Rome (stood 4th - 16th century), later replaced by current Basilica

  2. Athanasius is elected Patriarch bishop of Alexandria

    Athanasius I of Alexandria (296–298 – 2 May 373), also called Athanasius the Great, Athanasius the Confessor, or, among Coptic Christians, Athanasius the Apostolic, was a Christian theologian and the...

  3. Newly built city of Constantinople (Byzantium) dedicated to Emperor Constantine the Great, becomes the capital of the Ea

    Newly built city of Constantinople (Byzantium) dedicated to Emperor Constantine the Great, becomes the capital of the Eastern Roman Empire

  4. BC Alexander the Great defeats Darius III of Persia in the Battle of Gaugamela

    BC Alexander the Great defeats Darius III of Persia in the Battle of Gaugamela

  5. BC Macedonian army of Alexander the Great defeats Darius III of Persia in the Battle of the Granicus

    The Battle of the Granicus in May 334 BC was the first of three major battles fought between Alexander the Great of Macedon and the Persian Achaemenid Empire.

More from the 320s

Frequently Asked Questions

What happened on July 3, 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 Battle of Chrysopolis (AD 324), and was later executed on the orders of Constantine.
Why is Battle of Adrianople: Roman Emperor Constantine I defeats his co-emperor Lici... significant?
Valerius Licinianus Licinius was Roman emperor from 308 to 324.
Who was involved in Battle of Adrianople: Roman Emperor Constantine I defeats his co-emperor Lici...?
Key figures include Constantine the Great (Roman emperor from 306 to 337).

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