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324 Battle of Chrysopolis ★ ★ ★ ★ ★
Outcome: The final victory of Constantine I against Licinius, Augustus of the East 18 September 324
War  &  Enemy: Enemy:
Romans (Civil War)
Civil Wars of the Tetrarchy (306-324 AD)
Battle Type:
Pitched Battle
The Battlefield Chrysopolis Location:
Chrysoupolis , near Chalcedon in North-Western Asia Minor. The sites are today in Turkey, named respectively Üsküdar and Kadiköy.
Modern Country:
  The Byzantines(emperor:  Constantine I the Great) The Enemies
Commander: Constantine I the Great Licinius, Augustus of the East
Forces: probably, around 100,000 less than 100,000
Losses: 25,000 to 30,000 dead, with thousands more breaking and running in flight
Background story: After his defeat in Adrianople (324) and his navy's defeat in the Battle of the Hellespont , Licinius withdrew his forces from the city of Byzantium across the Bosporus to Chalcedon in Bithynia. Following this naval victory at Hellespont, Constantine crossed over to Asia Minor. He used a flotilla of light transports in order to avoid the main body of his opponent’s army, which, under the command of Licinius' newly appointed co-emperor Martinian, was guarding the coast at Lampsacus
The Battle:
Constantine I the Great
Constantine's army landed on the Asiatic shore of the Bosporus and marched southward towards Chalcedon. Licinius moved his army a few miles north, towards Chysoupolis. Constantine's army reached the environs of Chrysoupolis before the forces of Licinius. Constantine decided to take the initiative and attack.
He launched a single massive frontal assault on Licinius' troops and routed them winning a decisive victory in what was a large-scale battle. Licinius managed to escape and gathered around 30,000 of his surviving troops at the city of Nicomedia. Later, he was persuaded by his wife, and sister of Constantine, Constantia to surrender. He was executed some months later.
Noteworthy: Constantine's army fought again under his talismanic Christian standard, the labarum. Licinius had developed a superstitious dread of the labarum and forbade his troops from attacking it, or even looking directly at it.
Aftermath: Constantine became sole Emperor at last and built his new capital—Constantinople—at Byzantium. From a certain point of view, Chrysoupolis was the last Roman battle. The Byzantium era was about to begin.