Constantine the Great

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Constantine the Great (Flavius Valerius Aurelius Constantinus Augustus; Κωνσταντῖνος ὁ Μέγας; 27 February c. undefined 272 AD – 22 May 337 AD), also known as Constantine I, was a Roman Emperor who ruled between 306 and 337 AD.wikipedia
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Niš

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Born on the territory now known as Niš (Serbian Cyrillic: Ниш, located in Serbia), he was the son of Flavius Valerius Constantius, a Roman Army officer.
The city was among several taken during the Roman conquest in 75 BC; the Romans constructed the Via Militaris through the city in the 1st century, and it is also the birthplace of Constantine the Great, the first Christian Emperor and the founder of Constantinople, as well as Constantius III and Justin I.

Praetorian prefect

prefectpraefectus praetoriopraefecti praetorio
He restructured the government, separating civil and military authorities.
Under Constantine I, the office was much reduced in power and transformed into a purely civilian administrative post, while under his successors, territorially-defined praetorian prefectures emerged as the highest-level administrative division of the Empire.

Magister militum

magistri militummagister peditummagister militum per Orientem
He restructured the government, separating civil and military authorities.
Magister militum (Latin for "Master of the Soldiers", plural magistri militum) was a top-level military command used in the later Roman Empire, dating from the reign of Constantine the Great.

Licinius

Publius Flavius Galerius Valerius Licinianus LiciniusValerius Licinius320
He emerged victorious in a series of civil wars against Emperors Maxentius and Licinius to become sole ruler of both west and east by 324 AD.
For most of his reign he was the colleague and rival of Constantine I, with whom he co-authored the Edict of Milan that granted official toleration to Christians in the Roman Empire.

Serbia

🇷🇸SRBSerbian
Born on the territory now known as Niš (Serbian Cyrillic: Ниш, located in Serbia), he was the son of Flavius Valerius Constantius, a Roman Army officer.
The most famous of these was Constantine the Great, the first Christian Emperor, who issued an edict ordering religious tolerance throughout the Empire.

Constantine the Great and Christianity

ConstantineConstantine the GreatConstantine I
Constantine was the first Roman emperor to convert to Christianity.
During the reign of the Roman Emperor Constantine the Great (AD 306–337), Christianity began to transition to the dominant religion of the Roman Empire.

Solidus (coin)

solidussolidisou
To combat inflation he introduced the solidus, a new gold coin that became the standard for Byzantine and European currencies for more than a thousand years.
Under Constantine, who introduced it on a wide scale, it had a weight of about 4.5 grams.

Maxentius

Imp. Caesar M. Aurelius Valerius Maxentius AugustusMarcus Aurelius Valerius ''Maxentius'' AugustusMarcus Aurelius Valerius Maxentius
He emerged victorious in a series of civil wars against Emperors Maxentius and Licinius to become sole ruler of both west and east by 324 AD.
The latter part of his reign was preoccupied with civil war, allying with Maximinus II against Licinius and Constantine.

Christianity

ChristianChristiansChristian faith
Constantine was the first Roman emperor to convert to Christianity.
The Roman emperor Constantine the Great converted to Christianity and decriminalized it in the Edict of Milan (313).

York

City of YorkYork, EnglandCity of York Council
Constantine was acclaimed as emperor by the army at Eboracum (modern-day York) after his father's death in 306 AD.
Constantius I died in 306 AD during his stay in York, and his son Constantine the Great was proclaimed Emperor by the troops based in the fortress.

First Council of Nicaea

Council of NicaeaNicaeaCouncil of Nicea
He called the First Council of Nicaea in 325, which produced the statement of Christian belief known as the Nicene Creed.
The First Council of Nicaea was a council of Christian bishops convened in the Bithynian city of Nicaea (now İznik, Bursa province, Turkey) by the Roman Emperor Constantine I in AD 325.

Eusebius of Nicomedia

EusebiusEusebiansbishop Eusebius of Nicomedia
Although he lived much of his life as a pagan, and later as a catechumen, he joined the Christian faith on his deathbed, being baptised by Eusebius of Nicomedia.
Eusebius of Nicomedia (died 341) was the man who baptised Constantine the Great.

Praetorian prefecture

praetorian prefecturesPrefecturepraetorian prefect
He restructured the government, separating civil and military authorities.
Praetorian prefectures originated in the reign of Constantine I (r. 306-337), reaching their more or less final form in the last third of the 4th century and surviving until the 7th century, when the reforms of Heraclius diminished the prefecture's power, and the Muslim conquests forced the East Roman Empire to adopt the new theme system.

Edict of Milan

official toleration of Christianity313Christian legalization
He played an influential role in the proclamation of the Edict of Milan in 313, which declared religious tolerance for Christianity in the Roman empire.
Western Roman Emperor Constantine I and Licinius, who controlled the Balkans, met in Milan and, among other things, agreed to change policies towards Christians following the Edict of Toleration by Galerius issued two years earlier in Serdica.

Diocletian

Emperor DiocletianDiocletian Reformsreforms
Constantine was sent east, where he rose through the ranks to become a military tribune under Emperors Diocletian and Galerius. Lactantius' De Mortibus Persecutorum, a political Christian pamphlet on the reigns of Diocletian and the Tetrarchy, provides valuable but tendentious detail on Constantine's predecessors and early life.
The Diocletianic Persecution (303–312), the empire's last, largest, and bloodiest official persecution of Christianity, failed to eliminate Christianity in the empire; indeed, after 324, Christianity became the empire's preferred religion under Constantine.

Roman Empire

RomanRomansEmpire
The age of Constantine marked a distinct epoch in the history of the Roman Empire.
The Roman Empire was then divided between a Western Roman Empire, based in Milan and later Ravenna, and an Eastern Roman Empire, based in Nicomedia and later Constantinople, and it was ruled by multiple emperors (with the exception of the sole rule of Constantine between 324 and 337, and Theodosius between 392 and 395).

Donation of Constantine

forged documentsconstitutumDonation" of the Papal States
The Papal claim to temporal power in the High Middle Ages was based on the forged Donation of Constantine.
The Donation of Constantine is a forged Roman imperial decree by which the 4th-century emperor Constantine the Great supposedly transferred authority over Rome and the western part of the Roman Empire to the Pope.

Constantinople

ConstantinopolitanIstanbulcapital
He built a new imperial residence at Byzantium and renamed the city Constantinople (now Istanbul) after himself (the laudatory epithet of "New Rome" came later, and was never an official title).
It was reinaugurated in 324 from ancient Byzantium as the new capital of the Roman Empire by Emperor Constantine the Great, after whom it was named, and dedicated on 11 May 330.

Franks

FrankishFrankFrankish kingdom
Constantine pursued successful campaigns against the tribes on the Roman frontiers—the Franks, the Alamanni, the Goths, and the Sarmatians—even resettling territories abandoned by his predecessors during the Crisis of the Third Century.
Eumenius addressed the Franks in the matter of the execution of Frankish prisoners in the circus at Trier by Constantine I in 306 and certain other measures: Ubi nunc est illa ferocia?

Tetrarchy

tetrarchtetrarchicTetrarchs
His more immediate political legacy was that he replaced Diocletian's tetrarchy with the principle of dynastic succession by leaving the empire to his sons. Lactantius' De Mortibus Persecutorum, a political Christian pamphlet on the reigns of Diocletian and the Tetrarchy, provides valuable but tendentious detail on Constantine's predecessors and early life.
This tetrarchy lasted until c. 313, when mutually destructive conflict eliminated most of the claimants to power, leaving Constantine in control of the western half of the empire, and Licinius in control of the eastern half.

Istanbul

İstanbulConstantinopleIstanbul, Turkey
He built a new imperial residence at Byzantium and renamed the city Constantinople (now Istanbul) after himself (the laudatory epithet of "New Rome" came later, and was never an official title).
After Constantine the Great made it the new eastern capital of the Roman Empire in 330 CE, the city became widely known as Constantinople, which, as the Latinized form of "Κωνσταντινούπολις" (Konstantinoúpolis), means the "City of Constantine".

Lactantius

Lucius Caecilius Firmianus LactantiusFirmianus (Lactantius)
Lactantius' De Mortibus Persecutorum, a political Christian pamphlet on the reigns of Diocletian and the Tetrarchy, provides valuable but tendentious detail on Constantine's predecessors and early life.
Lucius Caecilius Firmianus Lactantius (c. 250 – c. 325) was an early Christian author who became an advisor to the first Christian Roman emperor, Constantine I, guiding his religious policy as it developed, and a tutor to his son Crispus.

Caesar (title)

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His father became Caesar, the deputy emperor in the west, in 293 AD.
The title of Caesar remained in use throughout the Constantinian period, with both Constantine I and his co-emperor and rival Licinius utilising it to mark their heirs.

Church of the Holy Sepulchre

Holy SepulchretombTomb of Christ
The Church of the Holy Sepulchre was built on his orders at the purported site of Jesus' tomb in Jerusalem and became the holiest place in Christendom.
After seeing a vision of a cross in the sky in 312, Constantine the Great converted to Christianity, signed the Edict of Milan legalising the religion, and sent his mother Helena to Jerusalem to look for Christ's tomb.

Christendom

ChristianChristian EuropeChristian world
The Church of the Holy Sepulchre was built on his orders at the purported site of Jesus' tomb in Jerusalem and became the holiest place in Christendom.
Early Christendom would close at the end of imperial persecution of Christians after the ascension of Constantine the Great and the Edict of Milan in AD 313 and the First Council of Nicaea in 325.