Roman

The transition from a single united empire to the later divided Western and Eastern empires was a gradual transformation. In July 285, Diocletian defeated rival Emperor Carinus and briefly became sole emperor of the Roman Empire. more...

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Diocletian saw that the vast Roman Empire was ungovernable by a single emperor in the face of internal pressures and military threats on two fronts. He therefore split the Empire in half along a north-west axis just east of Italy, and created two equal Emperors to rule under the title of Augustus. Diocletian was Augustus of the eastern half, and gave his long-time friend Maximian the title of Augustus in the western half. In doing so, Diocletian created what would become the Western Roman Empire and the Eastern Roman Empire. The western empire would collapse less than 200 years later, and the eastern empire would become the Byzantine Empire, centered in the Greek city of Byzantium, which would later be renamed Constantinople by the emperor Constantine I, and would survive another one thousand years.

In 293 authority was further divided, as each Augustus took a junior Emperor called Caesar to aid him in administrative matters, and to provide a line of succession; Galerius became Caesar under Diocletian and Constantius Chlorus Caesar under Maximian. This constituted what is called the Tetrarchy (in Greek: the leadership of four) by modern scholars. After Rome had been plagued by bloody disputes about the supreme authority, this finally formalized a peaceful succession of the emperor: in each half the Caesar rose up to replace the Augustus and proclaimed a new Caesar. On May 1, 305, Diocletian and Maximian abdicated in favor of their Caesars. Galerius named the two new Caesars: his nephew Maximinus for himself and Flavius Valerius Severus for Constantius. The arrangement worked well under Diocletian and Maximian and shortly thereafter. The internal tensions within the Roman government were less acute than they had been. In The Decline and Fall of the Roman Empire, Edward Gibbon notes that this arrangement worked well because of the affinity the four rulers had for each other. Gibbon says that this arrangement has been compared to a \"chorus of music.\" With the withdrawal of Diocletian and Maximian, this harmony disappeared.

The Tetrarchy would effectively collapse with the death of Constantius Chlorus on July 25, 306. Constantius's troops in Eboracum immediately proclaimed his son Constantine an Augustus. In August 306, Galerius promoted Severus to the position of Augustus. A revolt in Rome supported another claimant to the same title: Maxentius, son of Maximian, who was proclaimed Augustus on October 28, 306. His election was supported by the Praetorian Guard. This left the Empire with five rulers: four Augusti (Galerius, Constantine, Severus and Maxentius) and a Caesar (Maximinus).

The year 307 saw the return of Maximian to the role of Augustus alongside his son Maxentius, creating a total of six rulers of the Empire. Galerius and Severus campaigned against them in Italy. Severus was killed under command of Maxentius on September 16, 307. The two Augusti of Italy also managed to ally themselves with Constantine by having Constantine marry Fausta, the daughter of Maximian and sister of Maxentius. At the end of 307, the Empire had four Augusti (Maximian, Galerius, Constantine and Maxentius) and a sole Caesar.

Read more at Wikipedia.org