Cyzicus 308-324 CE
Æ Follis 21mm, 4,69g
Approximate birth year of Licinius in Moesa Superior.
Galerius is reinforced and leads another campaign against northern Mesopatamia. He is joined by his close friend Licinius.
November 11
Galerius calls a council to discuss the disruptive western provinces. Diocletian and Maximian attend. Maximian is forced to abdicate and Constantine the Great is demoted to Caesar under the new Augustus Licinius.
Licinius inflicts a defeat on the Sarmatians.
Maxentius loses Istria to Licinius.
May
Licinius reaches an agreement with Maximinus Daza to share the eastern provinces between them.
May 2
Care of Galeria Valeria and her mother are entrusted to Licinius. However, they flee to Maximinus Daia.
December
Constantine the Great forges an alliance with Licinius, giving him his sister Constantia in marriage.
The tetrarchy is replaced by two Emperors – Constantine I in the west and Licinius in the east.
February
Constantine the Great and Licinius meet in Milan to cement their marriage alliance. The two emperors sign the Edict of Milan, promising religious tolerance.
March
Licinius marries Flavia Julia Constantia, half sister of Constantine I.
April
Maximinus Daza takes Constantinople from Licinius.
April
Maximinus Daza takes Herakleia from Licinius after a short siege.
April 30
Licinius defeats Maximinus Daia at the Battle of Tzirallum.
August
Licinius orders for the death of Galeria Valeria and her mother.
August
Death of Maximinus Daza. Licinius then kills his wife and children.
October 8
Constantine I defeats Licinius at the Battle of Cibalae.
Galeria Valeria is betrayed by residents of Thessalonika. Soldiers of Licinius behead her and her mother in a public square and throw their bodies in the sea.
Constantine I and Licinius share a consulship.
July
Birth of Licinius II to Constantia and Licinius.
Constantine the Great defeats Licinius at the Battle of Cibalae.
October
Valens is raised by Licinius as co-emperor.
Constantine the Great and Licinius fight at the Battle of Mardia, where both sides take heavy losses. They agree to promote Crispus, Constantine II, and Licinius II to Caesars.
December
Licinius is humiliated in the Battle of Mardia by Constantine I.
February
Bowing to pressure by Constantine I, Licinius has his co-emperor Valens killed.
Licinius campaigns against the Sarmatians.
Licinius II is made consul by Licinius.
Licinius goes against the Edict of Milan and begins removing Christians from office.
Licinius accuses Constantine I of breaking their treaty when he pursues Sarmatians and then Goths into his territory.
The fleet of Constantine I takes moorage at Elaios against Licinius.
Constantine I defeats Licinius in a naval encounter.
July
Crispus, the son of Constantine the Great, achieves a huge naval victory over Licinius at the Battle of the Hellespont.
July 3
Licinius is soundly defeated by Constantine the Great at the Battle of Adrianople.
September 18
Constantine the Great defeats Licinius at the Battle of Chrysopolis. Licinius surrenders and are sent to live as private citizens.
Licinius is accused of a plot to kill Constantine the Great, is caught at Thessalonika, and is executed.