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Diocletian: marble, made in Florence, 17th century
Roman emperor
20 November 284 – 1 April 286
1 April 286 – 1 May 305
PredecessorCarinus (contested until July 285)[1]
SuccessorGalerius (East)
Constantius Chlorus (West)
Co-emperorMaximian (western emperor)
22 December 242–245[2]
Died3 December 311/312 (aged c. 68)
Full name
  • Gaius Valerius Diocles
  • Gaius Aurelius Valerius Diocletianus

Diocletian (Gaius Aurelius Valerius Diocletianus, about 245 to about 312) was Roman Emperor from 20 November 284 to 11 May 305. He was born in Dalmatia of poor parents. Diocletian ended the period known as the Crisis of the Third Century (235–284). He worked to return Rome to its former glory by making changes in key areas.

Religion: He persecuted Christians, crucifying more than any other emperor. He imposed the traditional polytheistic religion of the Romans.

Economy: Recognizing a gold drain from the western Mediterranean to the east, he tried to stop the inflation of the region by legislation. This did not work. He decreed that coins could only be made of gold or silver, stopping the trend of using lead in their creation. He made the tax system work better.

Military: Diocletian changed the army from the traditional garrison defense. He put small outposts of soldiers on the border. He got local soldiers from the border regions along the Rhine and Danube rivers. These soldiers farmed and lived with their families in a village atmosphere. They lit signal fires on signal towers to warn other outposts of possible invasion by Germans from across the border. These outpost soldiers got regular pay from Rome for their services. He allowed soldiers to move up through the ranks by "military credits" earned by years of loyal service and by actions on the field of battle.

Political structure[change | change source]

Diocletian established a form of government known as the tetrarchy. In this, the Empire was organised into four parts, each ruled by a co-emperor. Diocletian took charge of the eastern empire. The senior co-emperor was Maximian Augustus, a fellow officer. He took charge of the western empire. Later, two junior co-emperors were added: Galerius and Constantius Chlorus.

Finally, in 305, the two senior emperors abdicated and retired, and the two juniors rose to the rank of Augustus. They in turn were supported by two juniors: Severus II in the west under Constantius, and Maximinus in the east under Galerius. In this way, the Tetrarchy showed how it could reproduce itself.

Illyria[change | change source]

These men were from the Roman province of Illyria, several in the city of Sirmium, which would become one of the four capitals under this system. From the time of Domitian (81–96), when over half the Roman army was deployed in the Danubian regions, the Illyrian provinces had been the most important recruiting ground of the auxilia and later the legions.

In the 3rd century, Romanised Illyrians came to dominate the army's senior officer echelons. Ultimately, the Illyrian officer class seized control of the state itself.

Regions and capitals[change | change source]

The four Tetrarchs based themselves not at Rome but in other cities closer to the frontiers, mainly intended as headquarters for the defence of the empire. They faced Persia and the Germanic tribes. Also, there were many tribes from the eastern steppe which presented at the Rhine and Danube.

The four centres are known as the 'Tetrarchic capitals'. Although Rome ceased to be the operational capital, it was still the nominal capital of the entire empire. It had its own Prefect of the City, an idea later copied in Constantinople. The four Tetrarchic capitals were:

  • Nicomedia in northwestern Asia Minor (modern Izmit in Turkey), a base for defence against invasion from the Balkans and Persia's Sassanids was the capital of Diocletian, the eastern (and most senior) Augustus. In the final reorganisation by Constantine the Great, in 318, the domain, facing Sassanid Persia, became the pretorian prefecture Oriens 'the East', the core of later Byzantium.
  • Sirmium (modern Sremska Mitrovica) in the Vojvodina region of modern Serbia, and near Belgrade, on the Danube border, was the capital of Galerius, the eastern Caesar; this was to become the Balkans-Danube prefecture Illyricum.
  • Mediolanum (modern Milan, near the Alps) was the capital of Maximian, the western Augustus; his domain became "Italia et Africa", with only a short exterior border.
  • Augusta Treverorum (modern Trier, in Germany) was the capital of Constantius Chlorus, the western Caesar, near the strategic Rhine border, it had been the capital of Gallic emperor Tetricus I; this quarter became the prefecture Galliae.

Aquileia, a port on the Adriatic coast, and Eboracum (modern York, in northern England near the Scottish tribes), were also significant centres for Maximian and Constantius respectively.

In terms of regional jurisdiction there was no precise division between the four Tetrarchs, and this period did not see the Roman state actually split up into four distinct sub-empires. Each emperor had his zone of influence within the Roman Empire, but little more, mainly high command in a 'war theatre'. Each Tetrarch was himself often in the field, while delegating most of the administration to the hierarchic bureaucracy headed by his respective Praetorian Prefect, each supervising several Vicarii, the governors-general in charge of another new administrative level, the civil diocese. For a listing of the provinces, now known as eparchy, within each quarter (known as a praetorian prefecture), see Roman province.

In the West, the Augustus Maximian controlled the provinces west of the Adriatic Sea and the Syrtis, and within that region his Caesar, Constantius, controlled Gaul and Britain. In the East, the arrangements between the Augustus Diocletian and his Caesar, Galerius, were much more flexible.

Retirement and death[change | change source]

Diocletian's reforms fundamentally changed the structure of Roman imperial government, and stabilized the empire economically and militarily. This helped the empire to remain intact for another hundred years, despite having seemed near the brink of collapse in Diocletian's youth.

Weakened by illness, Diocletian left the imperial office on 1 May 305, and became the first Roman emperor to voluntarily abdicate the position.[3] He lived out his retirement in his palace on the Dalmatian coast, tending to his vegetable gardens. His palace eventually became the core of the modern-day city of Split.

Maximian attempted to return to power. Diocletian ordered him to step down permanently. Finally, Maximian was forced to commit suicide and the tetrarchy began to unravel . Diocletian despaired and died in 311, possibly of suicide.

Other websites[change | change source]

References[change | change source]

  1. Barnes, New Empire, 4.
  2. Barnes, New Empire, 30, 46; Bowman, "Diocletian and the First Tetrarchy" (CAH), 68.
  3. Barnes, Timothy D. 1981. Constantine and Eusebius. Cambridge, MA: Harvard University Press. ISBN 978-0-674-16531-1, 25–27; Lenski, "Reign of Constantine," 60; Odahl, Charles Matson. 2004. Constantine and the Christian Empire. New York: Routledge. Hardcover ISBN 0-415-17485-6 Paperback ISBN 0-415-38655-1 69–72; Potter, David S. 2005. The Roman Empire at bay: AD 180–395. New York: Routledge. Hardcover ISBN 0-415-10057-7 Paperback ISBN 0-415-10058-5 341–42.