Civil wars of the Tetrarchy
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Were a series of conflicts between the co-emperors of the Roman Empire (the system of Thetrarchy introduced by Diocletian divided the Roman Empire between two emperors, the augusti, and their junior colleagues and designated successors, the caesares). The war ended with Constantine I as undisputed Emperor.
Chronology
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January 306: The senior Roman emperors jointly abdicated and retired in 305 AD, allowing Constantius and Galerius to be elevated in rank to Augusti. They in turn appointed two new Caesars - Severus in the west under Constantius, and Maximinus Daia in the east under Galerius.
January 307: In 306, Constantius, the Western Roman Emperor, died. According to the rules of Tetrachic system, he had to be succeeded by his Caesar, Severus II. However, following his death, the troops proclaimed Constantine, his son, as Augustus.
January 308: Maxentius and Maximine usurpe Severus.
January 309: Maximian is forced to (re-)abdicate. As Maxentius is not recognized, Licinius is named Augustus of the west with immediate command in illyricum and Pannonia. Troops loyal to Galerius name Domitius Alexander as Augustus in Africa.
January 312: In 311, the Roman Emperor Galerius died, and his territory in the East was taken over by Licinius. Around the same time, Domitius was defeated by Maxentius in a significant battle.
January 312: In 311, Domitius Alexander, the Roman governor of Africa, was defeated by Maxentius, a rival claimant to the Roman throne. Around the same time, Galerius, another Roman emperor, died, and his territory was taken over by Licinius. This period marked a time of political turmoil and power struggles within the Roman Empire.
January 314: Licinius defeats Maximinus Daia.
January 314: Constantine defeats Maxentius.
January 317: Constantine seizes the Balkans.
January 325: In 324, Constantine, the Roman Emperor of the West, defeated Licinius, the Roman Emperor of the East, in the battle of Chrysopolis. This victory allowed Constantine to become the sole ruler of the Roman Empire.
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. This marked the end of the Crisis of the Third Century.
January 286: The first phase of the Tetrarchy, sometimes referred to as the Diarchy ('the rule of two'), involved the designation of the general Maximian as co-emperor of Diocletian.
January 294: In 293, feeling more focus was needed on both civic and military problems, Diocletian, with Maximian's consent, expanded the imperial college by appointing two Caesars.
