Emperor Constantine

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This article is about Constantine as an Emperor. For St. Constantine as a Saint, see Constantine the Great and Christianity.
"Constantine I" redirects here. For other uses, see Constantine I (disambiguation).
Constantine the Great
Constantine I
57th Emperor of the Roman Empire
Colossal marble head of Emperor Constantine the Great, Roman, 4th century
Reign 25 July 306 AD – 29 October 312 AD
29 October 312 – 19 September 324
19 September 324 – 22 May 337
Full name Flavius Valerius Aurelius Constantinus Augustus
Born 27 February c. 272
Birthplace Naissus, Moesia Superior (present-day Serbia)
Died 22 May 337(337-05-22) (aged 65)
Place of death Nicomedia
Predecessor Constantius I
Successor Constantine II
Constantius II
Constans I
Consort to Minervina
Issue Constantina
Constantine II
Constantius II
Dynasty Constantinian dynasty
Father Constantius Chlorus
Mother Helena

Constantine the Great (Latin: Flavius Valerius Aurelius Constantinus Augustus;Greek: Κωνσταντῖνος ὁ Μέγας; 27 February c. 272 – 22 May 337), also known as Constantine I or Saint Constantine, was Roman Emperor from 306 to 337. Constantine was the son of Flavius Valerius Constantius, a Roman army officer, and his consort Helena. His father became Caesar, the deputy emperor in the west in 293. Constantine was sent east, where he rose through the ranks to become a military tribune under the emperors Diocletian and Galerius. In 305, Constantius was raised to the rank of Augustus, senior western emperor, and Constantine was recalled west to campaign under his father in Britannia. Acclaimed as emperor by the army at Eburacum (York) after his father's death in 306, Constantine emerged victorious in a series of civil wars against the emperors Maxentius and Licinius to become sole ruler of both west and east by 324.

As emperor, Constantine enacted many administrative, financial, social, and military reforms to strengthen the empire. The government was restructured and civil and military authority separated. A new gold coin, the solidus, was introduced to combat inflation. It would become the standard for Byzantine and European currencies for more than a thousand years. The first Roman emperor to claim conversion to Christianity, Constantine played an influential role in the proclamation of the Edict of Milan, which decreed tolerance for Christianity in the empire. He called the First Council of Nicaea in 325, at which the Nicene Creed was professed by Christians. In military matters, the Roman army was reorganised to consist of mobile field units and garrison soldiers capable of countering internal threats and barbarian invasions. 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 turmoil of the previous century.

The age of Constantine marked a distinct epoch in the history of the Roman Empire. He built a new imperial residence at Byzantium and named it Constantinople after himself (the laudatory epithet of 'New Rome' came later, and was never an official title). It would later be the capital of what is now known as the Byzantine Empire for over one thousand years. Because of this, he is thought of as the founder of the Byzantine Empire. His more immediate political legacy was that, in leaving the empire to his sons, he replaced Diocletian's tetrarchy with the principle of dynastic succession. His reputation flourished during the lifetime of his children and centuries after his reign. The medieval church upheld him as a paragon of virtue while secular rulers invoked him as a prototype, a point of reference, and the symbol of imperial legitimacy and identity. Beginning with the renaissance, there were more critical appraisals of his reign due to the rediscovery of anti-Constantinian sources. Critics portrayed him as a despotic tyrant. Trends in modern and recent scholarship attempted to balance the extremes of previous scholarship.

Constantine—as the first Christian emperor—is a significant figure in the history of Christianity. The Church of the Holy Sepulchre, built on his orders at the purported site of Jesus' tomb in Jerusalem, became the holiest place in Christendom. The Papacy claimed temporal power through Constantine. He is venerated as a saint by Eastern Orthodox Christians, Byzantine Catholics, and Anglicans. The Eastern churches hold his memory in particular esteem, regarding Constantine as isapostolos or equal-to-an-apostle.


Constantine was a ruler of major historical importance, and he has always been a controversial figure. The fluctuations in Constantine's reputation reflect the nature of the ancient sources for his reign. These are abundant and detailed, but have been strongly influenced by the official propaganda of the period, and are often one-sided. There are no surviving histories or biographies dealing with Constantine's life and rule. The nearest replacement is Eusebius of Caesarea's Vita Constantini, a work that is a mixture of eulogy and hagiography. Written between 335 and circa 339, the Vita extols Constantine's moral and religious virtues. The Vita creates a contentiously positive image of Constantine, and modern historians have frequently challenged its reliability. The fullest secular life of Constantine is the anonymous Origo Constantini. A work of uncertain date, the Origo focuses on military and political events, to the neglect of cultural and religious matters.

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 ecclesiastical histories of Socrates, Sozomen, and Theodoret describe the ecclesiastic disputes of Constantine's later reign. Written during the reign of Theodosius II (408–50), a century after Constantine's reign, these ecclesiastic historians obscure the events and theologies of the Constantinian period through misdirection, misrepresentation and deliberate obscurity. The contemporary writings of the orthodox Christian Athanasius and the ecclesiastical history of the Arian Philostorgius also survive, though their biases are no less firm.

The epitomes of Aurelius Victor (De Caesaribus), Eutropius (Breviarium), Festus (Breviarium), and the anonymous author of the Epitome de Caesaribus offer compressed secular political and military histories of the period. Although not Christian, the epitomes paint a favorable image of Constantine, but omit reference to Constantine's religious policies. The Panegyrici Latini, a collection of panegyrics from the late third and early fourth centuries, provide valuable information on the politics and ideology of the tetrarchic period and the early life of Constantine. Contemporary architecture, such as the Arch of Constantine in Rome and palaces in Gamzigrad and Córdoba,epigraphic remains, and the coinage of the era complement the literary sources.

Early life

Remains of the luxurious residence palace of Mediana, erected by Constantine I near his birth town of Naissus

Flavius Valerius Constantinus, as he was originally named, was born in the city of Naissus, (today Niš, Serbia) part of the Dardania province of Moesia, on 27 February of an uncertain year, probably near 272. His father was Flavius Constantius, a native of Dardania province of Moesia (later Dacia Ripensis). Constantius was a tolerant and politically skilled man. Constantine probably spent little time with his father. Constantius was an officer in the Roman army, part of the Emperor Aurelian's imperial bodyguard. Constantius advanced through the ranks, earning the governorship of Dalmatia from Emperor Diocletian, another of Aurelian's companions from Illyricum, in 284 or 285. Constantine's mother was Helena, a Bithynian/Thracian woman of low social standing. It is uncertain whether she was legally married to Constantius or merely his concubine.

Constantine's parents and siblings, the dates in square brackets indicate the possession of minor titles

In July 285, Diocletian declared Maximian, another colleague from Illyricum, his co-emperor. Each emperor would have his own court, his own military and administrative faculties, and each would rule with a separate praetorian prefect as chief lieutenant. Maximian ruled in the West, from his capitals at Mediolanum (Milan, Italy) or Augusta Treverorum (Trier, Germany), while Diocletian ruled in the East, from Nicomedia (İzmit, Turkey). The division was merely pragmatic: the Empire was called "indivisible" in official panegyric, and both emperors could move freely throughout the Empire. In 288, Maximian appointed Constantius to serve as his praetorian prefect in Gaul. Constantius left Helena to marry Maximian's stepdaughter Theodora in 288 or 289.

Diocletian divided the Empire again in 293, appointing two Caesars (junior emperors) to rule over further subdivisions of East and West. Each would be subordinate to their respective Augustus (senior emperor) but would act with supreme authority in his assigned lands. This system would later be called the Tetrarchy. Diocletian's first appointee for the office of Caesar was Constantius; his second was Galerius, a native of Felix Romuliana. According to Lactantius, Galerius was a brutal, animalistic man. Although he shared the paganism of Rome's aristocracy, he seemed to them an alien figure, a semi-barbarian. On 1 March, Constantius was promoted to the office of Caesar, and dispatched to Gaul to fight the rebels Carausius and Allectus. In spite of meritocratic overtones, the Tetrarchy retained vestiges of hereditary privilege, and Constantine became the prime candidate for future appointment as Caesar as soon as his father took the position. Constantine went to the court of Diocletian, where he lived as his father's heir presumptive.

In the East

Head from a statue of Diocletian, Augustus of the East

Constantine received a formal education at Diocletian's court, where he learned Latin literature, Greek, and philosophy. The cultural environment in Nicomedia was open, fluid and socially mobile, and Constantine could mix with intellectuals both pagan and Christian. He may have attended the lectures of Lactantius, a Christian scholar of Latin in the city. Because Diocletian did not completely trust Constantius—none of the Tetrarchs fully trusted their colleagues—Constantine was held as something of a hostage, a tool to ensure Constantius's best behavior. Constantine was nonetheless a prominent member of the court: he fought for Diocletian and Galerius in Asia, and served in a variety of tribunates; he campaigned against barbarians on the Danube in 296, and fought the Persians under Diocletian in Syria (297) and under Galerius in Mesopotamia (298–99). By late 305, he had become a tribune of the first order, a tribunus ordinis primi.

Constantine had returned to Nicomedia from the eastern front by the spring of 303, in time to witness the beginnings of Diocletian's "Great Persecution", the most severe persecution of Christians in Roman history. In late 302, Diocletian and Galerius sent a messenger to the oracle of Apollo at Didyma with an inquiry about Christians. Constantine could recall his presence at the palace when the messenger returned, when Diocletian accepted his court's demands for universal persecution. On 23 February 303, Diocletian ordered the destruction of Nicomedia's new church, condemned its scriptures to the flames, and had its treasures seized. In the months that followed, churches and scriptures were destroyed, Christians were deprived of official ranks, and priests were imprisoned.

It is unlikely that Constantine played any role in the persecution. In his later writings he would attempt to present himself as an opponent of Diocletian's "sanguinary edicts" against the "worshippers of God", but nothing indicates that he opposed it effectively at the time. Although no contemporary Christian challenged Constantine for his inaction during the persecutions, it remained a political liability throughout his life.

On 1 May 305, Diocletian, as a result of a debilitating sickness taken in the winter of 304–5, announced his resignation. In a parallel ceremony in Milan, Maximian did the same. Lactantius states that Galerius manipulated the weakened Diocletian into resigning, and forced him to accept Galerius' allies in the imperial succession. According to Lactantius, the crowd listening to Diocletian's resignation speech believed, until the very last moment, that Diocletian would choose Constantine and Maxentius (Maximian's son) as his successors. It was not to be: Constantius and Galerius were promoted to Augusti, while Severus and Maximin were appointed their Caesars respectively. Constantine and Maxentius were ignored.

Some of the ancient sources detail plots that Galerius made on Constantine's life in the months following Diocletian's abdication. They assert that Galerius assigned Constantine to lead an advance unit in a cavalry charge through a swamp on the middle Danube, made him enter into single combat with a lion, and attempted to kill him in hunts and wars. Constantine always emerged victorious: the lion emerged from the contest in a poorer condition than Constantine; Constantine returned to Nicomedia from the Danube with a Sarmatian captive to drop at Galerius' feet. It is uncertain how much these tales can be trusted.

In the West

Constantine recognized the implicit danger in remaining at Galerius's court, where he was held as a virtual hostage. His career depended on being rescued by his father in the west. Constantius was quick to intervene. In the late spring or early summer of 305, Constantius requested leave for his son to help him campaign in Britain. After a long evening of drinking, Galerius granted the request. Constantine's later propaganda describes how he fled the court in the night, before Galerius could change his mind. He rode from post-house to post-house at high speed, hamstringing every horse in his wake. By the time Galerius awoke the following morning, Constantine had fled too far to be caught. Constantine joined his father in Gaul, at Bononia (Boulogne) before the summer of 305.

Bronze statue of Constantine I in York, England, near the spot where he was proclaimed Augustus in 306

From Bononia they crossed the Channel to Britain and made their way to Eboracum (York), capital of the province of Britannia Secunda and home to a large military base. Constantine was able to spend a year in northern Britain at his father's side, campaigning against the Picts beyond Hadrian's Wall in the summer and autumn. Constantius's campaign, like that of Septimius Severus before it, probably advanced far into the north without achieving great success. Constantius had become severely sick over the course of his reign, and died on 25 July 306 in Eboracum (York). Before dying, he declared his support for raising Constantine to the rank of full Augustus. The Alamannic king Chrocus, a barbarian taken into service under Constantius, then proclaimed Constantine as Augustus. The troops loyal to Constantius' memory followed him in acclamation. Gaul and Britain quickly accepted his rule; Iberia, which had been in his father's domain for less than a year, rejected it.

Constantine sent Galerius an official notice of Constantius's death and his own acclamation. Along with the notice, he included a portrait of himself in the robes of an Augustus. The portrait was wreathed in bay. He requested recognition as heir to his father's throne, and passed off responsibility for his unlawful ascension on his army, claiming they had "forced it upon him". Galerius was put into a fury by the message; he almost set the portrait on fire. His advisers calmed him, and argued that outright denial of Constantine's claims would mean certain war. Galerius was compelled to compromise: he granted Constantine the title "Caesar" rather than "Augustus" (the latter office went to Severus instead). Wishing to make it clear that he alone gave Constantine legitimacy, Galerius personally sent Constantine the emperor's traditional purple robes. Constantine accepted the decision, knowing that it would remove doubts as to his legitimacy.

Early rule

The portrait of Gaius Flavius Valerius Constantinus on a Roman coin. The inscription around the portrait is "Constantinus Aug[ustus]".

Constantine's share of the Empire consisted of Britain, Gaul, and Spain. He therefore commanded one of the largest Roman armies, stationed along the important Rhine frontier. After his promotion to emperor, Constantine remained in Britain, driving back the tribes of the Picts and secured his control in the northwestern dioceses. He completed the reconstruction of military bases begun under his father's rule, and ordered the repair of the region's roadways. He soon left for Augusta Treverorum (Trier) in Gaul, the Tetrarchic capital of the northwestern Roman Empire. The Franks, after learning of Constantine's acclamation, invaded Gaul across the lower Rhine over the winter of 306–7. Constantine drove them back beyond the Rhine and captured two of their kings, Ascaric and Merogaisus. The kings and their soldiers were fed to the beasts of Trier's amphitheater in the adventus (arrival) celebrations that followed.

Public baths (thermae) built in Trier by Constantine. More than 100 metres (328 ft) wide by 200 metres (656 ft) long, and capable of serving several thousands at a time, the baths were built to rival those of Rome.

Constantine began a major expansion of Trier. He strengthened the circuit wall around the city with military towers and fortified gates, and began building a palace complex in the northeastern part of the city. To the south of his palace, he ordered the construction of a large formal audience hall, and a massive imperial bathhouse. Constantine sponsored many building projects across Gaul during his tenure as emperor of the West, especially in Augustodunum (Autun) and Arelate (Arles). According to Lactantius, Constantine followed his father in following a tolerant policy towards Christianity. Although not yet a Christian, he probably judged it a more sensible policy than open persecution, and a way to distinguish himself from the "great persecutor", Galerius. Constantine decreed a formal end to persecution, and returned to Christians all they had lost during the persecutions.

Because Constantine was still largely untried and had a hint of illegitimacy about him, he relied on his father's reputation in his early propaganda: the earliest panegyrics to Constantine give as much coverage to his father's deeds as to those of Constantine himself. Constantine's military skill and building projects soon gave the panegyrist the opportunity to comment favorably on the similarities between father and son, and Eusebius remarked that Constantine was a "renewal, as it were, in his own person, of his father's life and reign". Constantinian coinage, sculpture and oratory also shows a new tendency for disdain towards the "barbarians" beyond the frontiers. After Constantine's victory over the Alemanni, he minted a coin issue depicting weeping and begging Alemannic tribesmen—"The Alemanni conquered"—beneath the phrase "Romans' rejoicing". There was little sympathy for these enemies. As his panegyrist declared: "It is a stupid clemency that spares the conquered foe."

Maxentius' rebellion

Dresden bust of Maxentius

Following Galerius' recognition of Constantine as caesar, Constantine's portrait was brought to Rome, as was customary. Maxentius mocked the portrait's subject as the son of a harlot, and lamented his own powerlessness. Maxentius, envious of Constantine's authority, seized the title of emperor on 28 October 306. Galerius refused to recognize him, but failed to unseat him. Galerius sent Severus against Maxentius, but during the campaign, Severus' armies, previously under command of Maxentius' father Maximian, defected, and Severus was seized and imprisoned. Maximian, brought out of retirement by his son's rebellion, left for Gaul to confer with Constantine in late 307. He offered to marry his daughter Fausta to Constantine, and elevate him to Augustan rank. In return, Constantine would reaffirm the old family alliance between Maximian and Constantius, and offer support to Maxentius' cause in Italy. Constantine accepted, and married Fausta in Trier in late summer 307. Constantine now gave Maxentius his meagre support, offering Maxentius political recognition.

Constantine remained aloof from the Italian conflict, however. Over the spring and summer of 307, he had left Gaul for Britain to avoid any involvement in the Italian turmoil; now, instead of giving Maxentius military aid, he sent his troops against Germanic tribes along the Rhine. In 308, he raided the territory of the Bructeri, and made a bridge across the Rhine at Colonia Agrippinensium (Cologne). In 310, he marched to the northern Rhine and fought the Franks. When not campaigning, he toured his lands advertising his benevolence, and supporting the economy and the arts. His refusal to participate in the war increased his popularity among his people, and strengthened his power base in the West. Maximian returned to Rome in the winter of 307–8, but soon fell out with his son. In early 308, after a failed attempt to usurp Maxentius' title, Maximian returned to Constantine's court.

On 11 November 308, Galerius called a general council at the military city of Carnuntum (Petronell-Carnuntum, Austria) to resolve the instability in the western provinces. In attendance were Diocletian, briefly returned from retirement, Galerius, and Maximian. Maximian was forced to abdicate again and Constantine was again demoted to Caesar. Licinius, one of Galerius' old military companions, was appointed Augustus of the west. The new system did not last long: Constantine refused to accept the demotion, and continued to style himself as Augustus on his coinage, even as other members of the Tetrarchy referred to him as a Caesar on theirs. Maximinus Daia was frustrated that he had been passed over for promotion while the newcomer Licinius had been raised to the office of Augustus, and demanded that Galerius promote him. Galerius offered to call both Maximinus and Constantine "sons of the Augusti", but neither accepted the new title. By the spring of 310, Galerius was referring to both men as Augusti.

Maximian's rebellion

A gold multiple of "Unconquered Constantine" with Sol Invictus, struck in 313. The use of Sol's image appealed to both the educated citizens of Gaul, who would recognize in it Apollo's patronage of Augustus and the arts; and to Christians, who found solar monotheism less objectionable than the traditional pagan pantheon.

In 310, a dispossessed Maximian rebelled against Constantine while Constantine was away campaigning against the Franks. Maximian had been sent south to Arles with a contingent of Constantine's army, in preparation for any attacks by Maxentius in southern Gaul. He announced that Constantine was dead, and took up the imperial purple. In spite of a large donative pledge to any who would support him as emperor, most of Constantine's army remained loyal to their emperor, and Maximian was soon compelled to leave. Constantine soon heard of the rebellion, abandoned his campaign against the Franks, and marched his army up the Rhine. At Cabillunum (Chalon-sur-Saône), he moved his troops onto waiting boats to row down the slow waters of the Saône to the quicker waters of the Rhone. He disembarked at Lugdunum (Lyon). Maximian fled to Massilia (Marseille), a town better able to withstand a long siege than Arles. It made little difference, however, as loyal citizens opened the rear gates to Constantine. Maximian was captured and reproved for his crimes. Constantine granted some clemency, but strongly encouraged his suicide. In July 310, Maximian hanged himself.

In spite of the earlier rupture in their relations, Maxentius was eager to present himself as his father's devoted son after his death. He began minting coins with his father's deified image, proclaiming his desire to avenge Maximian's death. Constantine initially presented the suicide as an unfortunate family tragedy. By 311, however, he was spreading another version. According to this, after Constantine had pardoned him, Maximian planned to murder Constantine in his sleep. Fausta learned of the plot and warned Constantine, who put a eunuch in his own place in bed. Maximian was apprehended when he killed the eunuch and was offered suicide, which he accepted. Along with using propaganda, Constantine instituted a damnatio memoriae on Maximian, destroying all inscriptions referring to him and eliminating any public work bearing his image.

The death of Maximian required a shift in Constantine's public image. He could no longer rely on his connection to the elder emperor Maximian, and needed a new source of legitimacy. In a speech delivered in Gaul on 25 July 310, the anonymous orator reveals a previously unknown dynastic connection to Claudius II, a third-century emperor famed for defeating the Goths and restoring order to the empire. Breaking away from tetrarchic models, the speech emphasizes Constantine's ancestral prerogative to rule, rather than principles of imperial equality. The new ideology expressed in the speech made Galerius and Maximian irrelevant to Constantine's right to rule. Indeed, the orator emphasizes ancestry to the exclusion of all other factors: "No chance agreement of men, nor some unexpected consequence of favor, made you emperor," the orator declares to Constantine.

The oration also moves away from the religious ideology of the Tetrarchy, with its focus on twin dynasties of Jupiter and Hercules. Instead, the orator proclaims that Constantine experienced a divine vision of Apollo and Victory granting him laurel wreaths of health and a long reign. In the likeness of Apollo Constantine recognized himself as the saving figure to whom would be granted "rule of the whole world", as the poet Virgil had once foretold. The oration's religious shift is paralleled by a similar shift in Constantine's coinage. In his early reign, the coinage of Constantine advertised Mars as his patron. From 310 on, Mars was replaced by Sol Invictus, a god conventionally identified with Apollo. There is little reason to believe that either the dynastic connection or the divine vision are anything other than fiction, but their proclamation strengthened Constantine's claims to legitimacy and increased his popularity among the citizens of Gaul.

Civil wars

War against Maxentius

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