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Flavius Valerius Constantius "Chlorus" ( – 25 July 306), also called Constantius I, was Roman emperor from 305 to 306. He was one of the four original members of the
Tetrarchy 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 juniors colleagues and designated successors, the '' caesares'' ...
established by
Diocletian Diocletian (; la, Gaius Aurelius Valerius Diocletianus, grc, Διοκλητιανός, Diokletianós; c. 242/245 – 311/312), nicknamed ''Iovius'', was Roman emperor from 284 until his abdication in 305. He was born Gaius Valerius Diocles ...
, first serving as
caesar Gaius Julius Caesar (; ; 12 July 100 BC – 15 March 44 BC), was a Roman general and statesman. A member of the First Triumvirate, Caesar led the Roman armies in the Gallic Wars before defeating his political rival Pompey in a civil war, an ...
from 293 to 305 and then ruling as
augustus Caesar Augustus (born Gaius Octavius; 23 September 63 BC – 19 August AD 14), also known as Octavian, was the first Roman emperor; he reigned from 27 BC until his death in AD 14. He is known for being the founder of the Roman Pr ...
until his death. Constantius was also father of
Constantine the Great Constantine I ( , ; la, Flavius Valerius Constantinus, ; ; 27 February 22 May 337), also known as Constantine the Great, was Roman emperor from AD 306 to 337, the first one to convert to Christianity. Born in Naissus, Dacia Mediterrane ...
, the first Christian emperor of Rome. The nickname Chlorus () was first popularized by
Byzantine The Byzantine Empire, also referred to as the Eastern Roman Empire or Byzantium, was the continuation of the Roman Empire primarily in its eastern provinces during Late Antiquity and the Middle Ages, when its capital city was Constantino ...
-era historians and not used during the emperor's lifetime. After his re-conquering of Roman Britain, he was given the title 'Redditor Lucis Aeternae', meaning 'The Restorer of Eternal Light'. Of humble origin, Constantius had a distinguished military career and rose to the top ranks of the army. Around 289 he set aside Helena, Constantine's mother, to marry a daughter of Emperor
Maximian Maximian ( la, Marcus Aurelius Valerius Maximianus; c. 250 – c. July 310), nicknamed ''Herculius'', was Roman emperor from 286 to 305. He was '' Caesar'' from 285 to 286, then ''Augustus'' from 286 to 305. He shared the latter title with his ...
, and in 293 was added to the imperial college by Maximian's colleague, Diocletian. Assigned to rule
Gaul Gaul ( la, Gallia) was a region of Western Europe Western Europe is the western region of Europe. The region's countries and territories vary depending on context. The concept of "the West" appeared in Europe in juxtaposition to "the Eas ...
, Constantius defeated the usurper
Carausius Marcus Aurelius Mausaeus Carausius (died 293) was a military commander of the Roman Empire in the 3rd century. He was a Menapian from Belgic Gaul, who usurped power in 286, during the Carausian Revolt, declaring himself emperor in Britain and ...
there and his successor
Allectus Allectus (died 296) was a Roman-Britannic usurper-emperor in Britain and northern Gaul from 293 to 296. History Allectus was treasurer to Carausius, a Menapian officer in the Roman navy who had seized power in Britain and northern Gaul in 286. I ...
in
Britain Britain most often refers to: * The United Kingdom, a sovereign state in Europe comprising the island of Great Britain, the north-eastern part of the island of Ireland and many smaller islands * Great Britain, the largest island in the United King ...
, and campaigned extensively along the Rhine frontier, defeating the
Alamanni The Alemanni or Alamanni, were a confederation of Germanic tribes * * * on the Upper Rhine River. First mentioned by Cassius Dio in the context of the campaign of Caracalla of 213, the Alemanni captured the in 260, and later expanded into pre ...
and
Franks The Franks ( la, Franci or ) were a group of Germanic peoples whose name was first mentioned in 3rd-century Roman sources, and associated with tribes between the Lower Rhine and the Ems River, on the edge of the Roman Empire.H. Schutz: Too ...
. When the
Diocletianic Persecution The Diocletianic or Great Persecution was the last and most severe persecution of Christians in the Roman Empire. In 303, the emperors Diocletian, Maximian, Galerius, and Constantius issued a series of edicts rescinding Christians' legal rights ...
was announced in 303, Constantius ordered the demolition of churches but did not actively hunt down Christians in his domain. After his re-conquering of Roman Britain, he was given the title 'Redditor Lucis Aeternae', meaning 'The Restorer of Ethernal Light'. Upon becoming senior emperor in May 305, Constantius launched a successful punitive campaign against the
Picts The Picts were a group of peoples who lived in what is now northern and eastern Scotland (north of the Firth of Forth) during Late Antiquity and the Early Middle Ages. Where they lived and what their culture was like can be inferred from ea ...
beyond the
Antonine Wall The Antonine Wall, known to the Romans as ''Vallum Antonini'', was a turf fortification on stone foundations, built by the Romans across what is now the Central Belt of Scotland, between the Firth of Clyde and the Firth of Forth. Built some ...
. He died suddenly at
Eboracum Eboracum () was a fort and later a city in the Roman province of Britannia. In its prime it was the largest town in northern Britain and a provincial capital. The site remained occupied after the decline of the Western Roman Empire and ultim ...
(
York York is a cathedral city with Roman origins, sited at the confluence of the rivers Ouse and Foss in North Yorkshire, England. It is the historic county town of Yorkshire. The city has many historic buildings and other structures, such as ...
) in July the following year. After Constantius's death, the army, perhaps at his own instigation, immediately acclaimed his son Constantine as emperor. This act contributed to the collapse of the Diocletianic tetrarchy, sparking a series of civil wars which only ended when Constantine finally united the whole Roman Empire under his rule in 324. According to the ''
Oxford Classical Dictionary The ''Oxford Classical Dictionary'' (''OCD'') is generally considered "the best one-volume dictionary on antiquity," an encyclopædic work in English consisting of articles relating to classical antiquity and its civilizations. It was first pub ...
'', "Constantinian propaganda bedevils assessment of Constantius, yet he appears to have been an able general and a generous ruler". His descendants, the
Constantinian dynasty The Constantinian dynasty is an informal name for the ruling family of the Roman Empire from Constantius Chlorus (died 306) to the death of Julian in 363. It is named after its most famous member, Constantine the Great, who became the sole rul ...
, ruled the Empire until the death of his grandson
Julian the Apostate Julian ( la, Flavius Claudius Julianus; grc-gre, Ἰουλιανός ; 331 – 26 June 363) was Roman emperor from 361 to 363, as well as a notable philosopher and author in Greek. His rejection of Christianity, and his promotion of Neopla ...
in 363.


Life


Early career

Constantius's birthday was 31 March; the year is unknown, but his career and the age of his eldest son imply a date no later than c. 250. Constantius was an Illyrian. He was born in Naissus,
Dacia Ripensis Dacia Ripensis () was the name of a Roman province in the northern Balkan peninsula, immediately south of the Middle Danube. Its capital was Ratiaria (modern Archar, Bulgaria). It was a district less urban than neighbouring Dacia Mediterranea ...
, a
Roman province The Roman provinces (Latin: ''provincia'', pl. ''provinciae'') were the administrative regions of Ancient Rome outside Roman Italy that were controlled by the Romans under the Roman Republic and later the Roman Empire. Each province was rule ...
on the south bank of the Middle Danube – the empire's frontier – with its capital at
Ratiaria Ratiaria (or: Raetiaria, Retiaria, Reciaria, Razaria; bg, Рациария; el, Ραζαρία μητρόπολις;) was a city founded by the Moesians, a Daco- Thracian tribe, in the 4th century BC, along the river Danube. In Roman times it ...
(modern Archar). According to the unreliable ''
Historia Augusta The ''Historia Augusta'' (English: ''Augustan History'') is a late Roman collection of biographies, written in Latin, of the Roman emperors, their junior colleagues, designated heirs and usurpers from 117 to 284. Supposedly modeled on the si ...
'' he was the son of Eutropius, a
nobleman Nobility is a social class found in many societies that have an aristocracy. It is normally ranked immediately below royalty. Nobility has often been an estate of the realm with many exclusive functions and characteristics. The characteris ...
from the province of
Moesia Superior Moesia (; Latin: ''Moesia''; el, Μοισία, Moisía) was an ancient region and later Roman province situated in the Balkans south of the Danube River, which included most of the territory of modern eastern Serbia, Kosovo, north-eastern Al ...
, and Claudia, a niece of the emperors
Claudius Gothicus Marcus Aurelius Claudius "Gothicus" (10 May 214 – January/April 270), also known as Claudius II, was Roman emperor from 268 to 270. During his reign he fought successfully against the Alemanni and decisively defeated the Goths at the Battle o ...
and Quintillus. The same source also gives Claudius the nomina " Flavius
Valerius The gens Valeria was a patrician family at ancient Rome, prominent from the very beginning of the Republic to the latest period of the Empire. Publius Valerius Poplicola was one of the consuls in 509 BC, the year that saw the overthrow of ...
" to strengthen his connection to Constantius. Modern historians suspect this maternal connection to be a genealogical fabrication created by his son
Constantine I Constantine I ( , ; la, Flavius Valerius Constantinus, ; ; 27 February 22 May 337), also known as Constantine the Great, was Roman emperor from AD 306 to 337, the first one to convert to Christianity. Born in Naissus, Dacia Mediterrane ...
, and that his family was of humble origins. Constantine probably sought to dissociate his father's background from the memory of Maximian. Constantius was a member of the '' Protectores Augusti Nostri'' under the emperor
Aurelian Aurelian ( la, Lucius Domitius Aurelianus; 9 September 214 October 275) was a Roman emperor, who reigned during the Crisis of the Third Century, from 270 to 275. As emperor, he won an unprecedented series of military victories which reunited t ...
and fought in the east against the secessionist
Palmyrene Empire The Palmyrene Empire was a short-lived breakaway state from the Roman Empire resulting from the Crisis of the Third Century. Named after its capital city, Palmyra, it encompassed the Roman provinces of Syria Palaestina, Arabia Petraea, and Egyp ...
.Potter, p. 288 While the claim that he had been made a '' dux'' under the emperor Probus is probably a fabrication, he certainly attained the rank of ''
tribunus Tribune () was the title of various elected officials in ancient Rome. The two most important were the tribunes of the plebs and the military tribunes. For most of Roman history, a college of ten tribunes of the plebs acted as a check on the ...
'' within the army, and during the reign of
Carus Marcus Aurelius Carus (c. 222 – July or August 283) was Roman emperor from 282 to 283. During his short reign, Carus fought the Germanic tribes and Sarmatians along the Danube frontier with success. He died while campaigning against th ...
he was raised to the position of ''
praeses ''Praeses'' (Latin  ''praesides'') is a Latin word meaning "placed before" or "at the head". In antiquity, notably under the Roman Dominate, it was used to refer to Roman governors; it continues to see some use for various modern positions. ...
'', or governor, of the province of
Dalmatia Dalmatia (; hr, Dalmacija ; it, Dalmazia; see names in other languages) is one of the four historical regions of Croatia, alongside Croatia proper, Slavonia, and Istria. Dalmatia is a narrow belt of the east shore of the Adriatic Sea, stret ...
. It has been conjectured that he switched allegiances to support the claims of the future emperor
Diocletian Diocletian (; la, Gaius Aurelius Valerius Diocletianus, grc, Διοκλητιανός, Diokletianós; c. 242/245 – 311/312), nicknamed ''Iovius'', was Roman emperor from 284 until his abdication in 305. He was born Gaius Valerius Diocles ...
just before Diocletian defeated
Carinus Marcus Aurelius Carinus (died 285) was Roman emperor from 283 to 285. The elder son of emperor Carus, he was first appointed ''Caesar'' and in the beginning of 283 co-emperor of the western portion of the empire by his father. Official accoun ...
, the son of Carus, at the Battle of the Margus in July 285. In 286, Diocletian elevated a military colleague,
Maximian Maximian ( la, Marcus Aurelius Valerius Maximianus; c. 250 – c. July 310), nicknamed ''Herculius'', was Roman emperor from 286 to 305. He was '' Caesar'' from 285 to 286, then ''Augustus'' from 286 to 305. He shared the latter title with his ...
, to the throne as co-emperor of the western provinces,Southern, p. 142 while Diocletian took over the eastern provinces, beginning the process that would eventually see the division of the
Roman Empire The Roman Empire ( la, Imperium Romanum ; grc-gre, Βασιλεία τῶν Ῥωμαίων, Basileía tôn Rhōmaíōn) was the post- Republican period of ancient Rome. As a polity, it included large territorial holdings around the Medit ...
into two halves, a Western and an
Eastern Eastern may refer to: Transportation *China Eastern Airlines, a current Chinese airline based in Shanghai * Eastern Air, former name of Zambia Skyways *Eastern Air Lines, a defunct American airline that operated from 1926 to 1991 *Eastern Air L ...
portion. By 288, his period as governor now over, Constantius had been made
praetorian prefect The praetorian prefect ( la, praefectus praetorio, el, ) was a high office in the Roman Empire. Originating as the commander of the Praetorian Guard, the office gradually acquired extensive legal and administrative functions, with its holders b ...
in the west under Maximian. Throughout 287 and into 288, Constantius, under the command of Maximian, was involved in a war against the
Alamanni The Alemanni or Alamanni, were a confederation of Germanic tribes * * * on the Upper Rhine River. First mentioned by Cassius Dio in the context of the campaign of Caracalla of 213, the Alemanni captured the in 260, and later expanded into pre ...
, carrying out attacks on the territory of the
barbarian A barbarian (or savage) is someone who is perceived to be either uncivilized or primitive. The designation is usually applied as a generalization based on a popular stereotype; barbarians can be members of any nation judged by some to be less ...
tribes across the
Rhine ), Surselva, Graubünden, Switzerland , source1_coordinates= , source1_elevation = , source2 = Rein Posteriur/Hinterrhein , source2_location = Paradies Glacier, Graubünden, Switzerland , source2_coordinates= , sour ...
and
Danube The Danube ( ; ) is a river that was once a long-standing frontier of the Roman Empire and today connects 10 European countries, running through their territories or being a border. Originating in Germany, the Danube flows southeast for , pa ...
rivers.Southern, p. 142 To consolidate the ties between himself and Emperor Maximian, Constantius divorced his concubine Helena and married the emperor's daughter, Theodora.


Elevation as Caesar

By 293,
Diocletian Diocletian (; la, Gaius Aurelius Valerius Diocletianus, grc, Διοκλητιανός, Diokletianós; c. 242/245 – 311/312), nicknamed ''Iovius'', was Roman emperor from 284 until his abdication in 305. He was born Gaius Valerius Diocles ...
, conscious of the ambitions of his co-emperor for his new son-in-law, allowed Maximian to promote Constantius in a new power sharing arrangement known as the
Tetrarchy 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 juniors colleagues and designated successors, the '' caesares'' ...
. The eastern and western provinces would each be ruled by an ''augustus'', supported by a ''caesar''. Both ''caesares'' had the right of succession once the ruling ''augustus'' died.Southern, p. 145 At
Mediolanum Mediolanum, the ancient city where Milan now stands, was originally an Insubrian city, but afterwards became an important Roman city in northern Italy. The city was settled by the Insubres around 600 BC, conquered by the Romans in 222 BC, an ...
(
Milan Milan ( , , Lombard: ; it, Milano ) is a city in northern Italy, capital of Lombardy, and the second-most populous city proper in Italy after Rome. The city proper has a population of about 1.4 million, while its metropolitan city ...
) on 1 March 293, Constantius was formally appointed as Maximian's ''caesar''. He adopted the name "Flavius Valerius Constantius", and, being equated with Maximian, also took on "Herculius".Southern, p. 147 His given command consisted of
Gaul Gaul ( la, Gallia) was a region of Western Europe Western Europe is the western region of Europe. The region's countries and territories vary depending on context. The concept of "the West" appeared in Europe in juxtaposition to "the Eas ...
,
Britannia Britannia () is the national personification of Britain as a helmeted female warrior holding a trident and shield. An image first used in classical antiquity, the Latin ''Britannia'' was the name variously applied to the British Isles, Gr ...
and possibly
Hispania Hispania ( la, Hispānia , ; nearly identically pronounced in Spanish, Portuguese, Catalan, and Italian) was the Roman name for the Iberian Peninsula and its provinces. Under the Roman Republic, Hispania was divided into two provinces: His ...
.
Diocletian Diocletian (; la, Gaius Aurelius Valerius Diocletianus, grc, Διοκλητιανός, Diokletianós; c. 242/245 – 311/312), nicknamed ''Iovius'', was Roman emperor from 284 until his abdication in 305. He was born Gaius Valerius Diocles ...
, the eastern ''augustus'', in order to keep the balance of power in the ''imperium'',Southern, p. 145 elevated
Galerius Gaius Galerius Valerius Maximianus (; 258 – May 311) was Roman emperor from 305 to 311. During his reign he campaigned, aided by Diocletian, against the Sasanian Empire, sacking their capital Ctesiphon in 299. He also campaigned across the ...
as his ''caesar'', possibly on 21 May 293 at Philippopolis (
Plovdiv Plovdiv ( bg, Пловдив, ), is the second-largest city in Bulgaria, standing on the banks of the Maritsa river in the historical region of Thrace. It has a population of 346,893 and 675,000 in the greater metropolitan area. Plovdiv is the ...
). Constantius was the more senior of the two ''caesares'', and on official documents he always took precedence, being mentioned before Galerius.Southern, p. 147 Constantius' capital was to be located at
Augusta Treverorum Trier in Rhineland-Palatinate, whose history dates to the Roman Empire, is often claimed to be the oldest city in Germany. Traditionally it was known in English by its French name of Treves. Prehistory The first traces of human settlement i ...
(
Trier Trier ( , ; lb, Tréier ), formerly known in English as Trèves ( ;) and Triers (see also names in other languages), is a city on the banks of the Moselle in Germany. It lies in a valley between low vine-covered hills of red sandstone in the ...
). Constantius' first task on becoming ''caesar'' was to deal with the
Roman usurper Roman usurpers were individuals or groups of individuals who obtained or tried to obtain power by force and without legitimate legal authority. Usurpation was endemic during the Roman imperial era, especially from the crisis of the third centur ...
Carausius Marcus Aurelius Mausaeus Carausius (died 293) was a military commander of the Roman Empire in the 3rd century. He was a Menapian from Belgic Gaul, who usurped power in 286, during the Carausian Revolt, declaring himself emperor in Britain and ...
who had declared himself emperor in Britannia and northern Gaul in 286. In late 293, Constantius defeated the forces of Carausius in Gaul, capturing Bononia (
Boulogne-sur-Mer Boulogne-sur-Mer (; pcd, Boulonne-su-Mér; nl, Bonen; la, Gesoriacum or ''Bononia''), often called just Boulogne (, ), is a coastal city in Northern France. It is a sub-prefecture of the department of Pas-de-Calais. Boulogne lies on the C ...
). Carausius was then assassinated by his '' rationalis'' (finance officer)
Allectus Allectus (died 296) was a Roman-Britannic usurper-emperor in Britain and northern Gaul from 293 to 296. History Allectus was treasurer to Carausius, a Menapian officer in the Roman navy who had seized power in Britain and northern Gaul in 286. I ...
, who assumed command of the British provinces until his death in 296. Constantius spent the next two years neutralising the threat of the
Franks The Franks ( la, Franci or ) were a group of Germanic peoples whose name was first mentioned in 3rd-century Roman sources, and associated with tribes between the Lower Rhine and the Ems River, on the edge of the Roman Empire.H. Schutz: Too ...
who were the allies of Allectus,Southern, pg. 149 as northern Gaul remained under the control of the British usurper until at least 295. He also battled against the
Alamanni The Alemanni or Alamanni, were a confederation of Germanic tribes * * * on the Upper Rhine River. First mentioned by Cassius Dio in the context of the campaign of Caracalla of 213, the Alemanni captured the in 260, and later expanded into pre ...
, achieving some victories at the mouth of the
Rhine ), Surselva, Graubünden, Switzerland , source1_coordinates= , source1_elevation = , source2 = Rein Posteriur/Hinterrhein , source2_location = Paradies Glacier, Graubünden, Switzerland , source2_coordinates= , sour ...
in 295. Administrative concerns meant he made at least one trip to Italy during this time as well. Only when he felt ready (and only when Maximian finally came to relieve him at the Rhine frontier)Southern, p. 150 did he assemble two invasion fleets with the intent of crossing the
English Channel The English Channel, "The Sleeve"; nrf, la Maunche, "The Sleeve" ( Cotentinais) or ( Jèrriais), (Guernésiais), "The Channel"; br, Mor Breizh, "Sea of Brittany"; cy, Môr Udd, "Lord's Sea"; kw, Mor Bretannek, "British Sea"; nl, Het Kan ...
. The first was entrusted to Julius Asclepiodotus, Constantius' long-serving
Praetorian prefect The praetorian prefect ( la, praefectus praetorio, el, ) was a high office in the Roman Empire. Originating as the commander of the Praetorian Guard, the office gradually acquired extensive legal and administrative functions, with its holders b ...
, who sailed from the mouth of the
Seine ) , mouth_location = Le Havre/ Honfleur , mouth_coordinates = , mouth_elevation = , progression = , river_system = Seine basin , basin_size = , tributaries_left = Yonne, Loing, Eure, Risle , tributar ...
, while the other, under the command of Constantius himself, was launched from his base at Bononia. The fleet under Asclepiodotus landed near the
Isle of Wight The Isle of Wight ( ) is a county in the English Channel, off the coast of Hampshire, from which it is separated by the Solent. It is the largest and second-most populous island of England. Referred to as 'The Island' by residents, the Isl ...
, and his army encountered the forces of Allectus, resulting in the defeat and death of the usurper. Constantius in the meantime occupied
Londinium Londinium, also known as Roman London, was the capital of Roman Britain during most of the period of Roman rule. It was originally a settlement established on the current site of the City of London around AD 47–50. It sat at a key cros ...
(
London London is the capital and List of urban areas in the United Kingdom, largest city of England and the United Kingdom, with a population of just under 9 million. It stands on the River Thames in south-east England at the head of a estuary dow ...
), saving the city from an attack by Frankish mercenaries who were now roaming the province without a paymaster. Constantius massacred all of them.Southern, p. 150 Constantius remained in Britannia for a few months, replaced most of Allectus' officers, and the British provinces were probably at this time subdivided along the lines of Diocletian's other administrative reforms of the Empire. The result was the division of Britannia Superior into Maxima Caesariensis and Britannia Prima, while Flavia Caesariensis and Britannia Secunda were carved out of Britannia Inferior. He also restored
Hadrian's Wall Hadrian's Wall ( la, Vallum Aelium), also known as the Roman Wall, Picts' Wall, or ''Vallum Hadriani'' in Latin, is a former defensive fortification of the Roman province of Britannia, begun in AD 122 in the reign of the Emperor Hadrian. ...
and its forts. Later in 298, Constantius fought in the Battle of Lingones (
Langres Langres () is a commune in northeastern France. It is a subprefecture of the department of Haute-Marne, in the region of Grand Est. History As the capital of the Romanized Gallic tribe known as the Lingones, it was called Andematunnum, the ...
) against the
Alemanni The Alemanni or Alamanni, were a confederation of Germanic tribes * * * on the Upper Rhine River. First mentioned by Cassius Dio in the context of the campaign of Caracalla of 213, the Alemanni captured the in 260, and later expanded into pres ...
. He was shut up in the city, but was relieved by his army after six hours and defeated the enemy. He defeated them again at Vindonissa thereby strengthening the defences of the
Rhine ), Surselva, Graubünden, Switzerland , source1_coordinates= , source1_elevation = , source2 = Rein Posteriur/Hinterrhein , source2_location = Paradies Glacier, Graubünden, Switzerland , source2_coordinates= , sour ...
frontier. In 300, he fought against the
Franks The Franks ( la, Franci or ) were a group of Germanic peoples whose name was first mentioned in 3rd-century Roman sources, and associated with tribes between the Lower Rhine and the Ems River, on the edge of the Roman Empire.H. Schutz: Too ...
on the Rhine frontier,Southern, pg. 152 and as part of his overall strategy to buttress the frontier, Constantius settled the Franks in the deserted parts of
Gaul Gaul ( la, Gallia) was a region of Western Europe Western Europe is the western region of Europe. The region's countries and territories vary depending on context. The concept of "the West" appeared in Europe in juxtaposition to "the Eas ...
to repopulate the devastated areas. Nevertheless, over the next three years the Rhine frontier continued to occupy Constantius' attention. From 303 – the beginning of the
Diocletianic Persecution The Diocletianic or Great Persecution was the last and most severe persecution of Christians in the Roman Empire. In 303, the emperors Diocletian, Maximian, Galerius, and Constantius issued a series of edicts rescinding Christians' legal rights ...
– Constantius began to enforce the imperial edicts dealing with the
persecution of Christians The persecution of Christians can be historically traced from the first century of the Christian era to the present day. Christian missionaries and converts to Christianity have both been targeted for persecution, sometimes to the point of ...
, which ordered the destruction of churches. The campaign was avidly pursued by
Galerius Gaius Galerius Valerius Maximianus (; 258 – May 311) was Roman emperor from 305 to 311. During his reign he campaigned, aided by Diocletian, against the Sasanian Empire, sacking their capital Ctesiphon in 299. He also campaigned across the ...
, who noticed that Constantius was well-disposed towards the
Christians Christians () are people who follow or adhere to Christianity, a monotheistic Abrahamic religion based on the life and teachings of Jesus Christ. The words ''Christ'' and ''Christian'' derive from the Koine Greek title ''Christós'' (Χρ ...
, and who saw it as a method of advancing his career prospects with the aging Diocletian. Of the four Tetrarchs, Constantius made the least effort to implement the decrees in the western provinces that were under his direct authority, limiting himself to knocking down a handful of churches.DiMaio, ''Constantine I Chlorus''
Eusebius Eusebius of Caesarea (; grc-gre, Εὐσέβιος ; 260/265 – 30 May 339), also known as Eusebius Pamphilus (from the grc-gre, Εὐσέβιος τοῦ Παμφίλου), was a Greek historian of Christianity, exegete, and Christia ...
denied that Constantius destroyed Christian buildings, but
Lactantius Lucius Caecilius Firmianus Lactantius (c. 250 – c. 325) was an early Christian author who became an advisor to Roman emperor, Constantine I, guiding his Christian religious policy in its initial stages of emergence, and a tutor to his son Cri ...
records that he did.


Accession as Augustus and death

Between 303 and 305, Galerius began maneuvering to ensure that he would be in a position to take power from Constantius after the death of Diocletian. In 304, Maximian met with Galerius, probably to discuss the succession issue and Constantius either was not invited or could not make it due to the situation on the Rhine. Although prior to 303 there appeared to be tacit agreement among the Tetrarchs that Constantius's son Constantine and Maximian's son
Maxentius Marcus Aurelius Valerius Maxentius (c. 283 – 28 October 312) was a Roman emperor, who reigned from 306 until his death in 312. Despite ruling in Italy and North Africa, and having the recognition of the Senate in Rome, he was not recognized ...
were to be promoted to the rank of ''caesar'' once Diocletian and Maximian had resigned the purple, by the end of 304 Galerius had convinced Diocletian (who in turn convinced Maximian) to appoint Galerius's nominees
Severus Severus is the name of various historical and fictional figures, including: ;Emperors of the Roman empire * Septimius Severus (145–211), Roman emperor from 193 to 211 (rarely known as ''Severus I.'') *Severus Caracalla (188–217), Roman emperor ...
and Maximinus as ''caesares''. Diocletian and Maximian stepped down as co-emperors on 1 May 305, possibly due to Diocletian's poor health. Before the assembled armies at Mediolanum, Maximian removed his purple cloak and handed it to Severus, the new ''caesar'', and proclaimed Constantius as ''augustus''. The same scene played out at
Nicomedia Nicomedia (; el, Νικομήδεια, ''Nikomedeia''; modern İzmit) was an ancient Greek city located in what is now Turkey. In 286, Nicomedia became the eastern and most senior capital city of the Roman Empire (chosen by the emperor Diocleti ...
(
İzmit İzmit () is a district and the central district of Kocaeli Province, Kocaeli province, Turkey. It is located at the Gulf of İzmit in the Sea of Marmara, about east of Istanbul, on the northwestern part of Anatolia. As of the last 31/12/2019 ...
) under the authority of Diocletian. Constantius, notionally the senior emperor, ruled the western provinces, while Galerius took the eastern provinces. Constantine, disappointed in his hopes to become a ''caesar'', fled the court of Galerius after Constantius had asked Galerius to release his son as Constantius was ill. Constantine joined his father's court at the coast of Gaul, just as he was preparing to campaign in Britain. In 305, Constantius crossed over into Britain, travelled to the far north of the island and launched a military expedition against the
Picts The Picts were a group of peoples who lived in what is now northern and eastern Scotland (north of the Firth of Forth) during Late Antiquity and the Early Middle Ages. Where they lived and what their culture was like can be inferred from ea ...
, claiming a victory against them and the title ''Britannicus Maximus II'' by 7 January 306. After retiring to
Eboracum Eboracum () was a fort and later a city in the Roman province of Britannia. In its prime it was the largest town in northern Britain and a provincial capital. The site remained occupied after the decline of the Western Roman Empire and ultim ...
(
York York is a cathedral city with Roman origins, sited at the confluence of the rivers Ouse and Foss in North Yorkshire, England. It is the historic county town of Yorkshire. The city has many historic buildings and other structures, such as ...
) for the winter, Constantius had planned to continue the campaign, but on 25 July 306 he died. As he was dying, Constantius recommended his son to the army as his successor; consequently, Constantine was declared emperor by the legions at York.


Family

Constantius was either married to, or was in concubinage with, Helena, who was probably from
Nicomedia Nicomedia (; el, Νικομήδεια, ''Nikomedeia''; modern İzmit) was an ancient Greek city located in what is now Turkey. In 286, Nicomedia became the eastern and most senior capital city of the Roman Empire (chosen by the emperor Diocleti ...
in Asia Minor. They had one son: Constantine. In 289, political developments forced him to divorce Helena. He married Theodora,
Maximian Maximian ( la, Marcus Aurelius Valerius Maximianus; c. 250 – c. July 310), nicknamed ''Herculius'', was Roman emperor from 286 to 305. He was '' Caesar'' from 285 to 286, then ''Augustus'' from 286 to 305. He shared the latter title with his ...
's daughter. They had six children: *
Flavius Dalmatius :''This article deals with the censor. For the Caesar (335-337) Flavius Dalmatius, son of the censor, see Dalmatius. Flavius Dalmatius (died 337), also known as Dalmatius the Censor, was a censor (333), and a member of the Constantinian dynasty, ...
* Julius Constantius *
Hannibalianus __NOTOC__ Flavius Hannibalianus (also Hanniballianus; died September 337) was a member of the Constantinian dynasty, which ruled over the Roman Empire in the 4th century AD. Hannibalianus was the son of Flavius Dalmatius, and thus nephew of Con ...
* Flavia Julia Constantia *
Anastasia Anastasia (from el, Ἀναστασία, translit=Anastasía) is a feminine given name of Greek origin, derived from the Greek word (), meaning "resurrection". It is a popular name in Eastern Europe, particularly in Russia, where it was the mos ...
, married to Bassianus * Eutropia The name of Anastasia () may indicate a sympathy with Christian or Jewish culture.


Family tree

Emperors are shown with a rounded-corner border with their dates as
Augusti ''Augustus'' (plural ''Augusti''; , ; "majestic", "great" or "venerable") was an ancient Roman title given as both name and title to Gaius Julius Caesar Octavianus (often referred to simply as Augustus), Rome's first Emperor. On his death, it ...
, names with a thicker border appear in both sections 1: Constantine's parents and half-siblings 2: Constantine's children


Legend


Christian legends

As the father of Constantine, a number of Christian legends have grown up around Constantius. Eusebius's ''Life of Constantine'' claims that Constantius was himself a Christian, although he pretended to be a pagan, and while Caesar under Diocletian, took no part in the Emperor's persecutions. It was claimed that his first wife, Helena, found the
True Cross The True Cross is the cross upon which Jesus was said to have been crucified, particularly as an object of religious veneration. There are no early accounts that the apostles or early Christians preserved the physical cross themselves, althou ...
.


British legends

Constantius's activities in Britain were remembered in medieval Welsh legend, which frequently confused his family with that of
Magnus Maximus Magnus Maximus (; cy, Macsen Wledig ; died 8 August 388) was Roman emperor of the Western Roman Empire from 383 to 388. He usurped the throne from emperor Gratian in 383 through negotiation with emperor Theodosius I. He was made emperor in ...
, who also was said to have wed a Saint Elen and sired a son named Constantine while in Britain.
Henry of Huntingdon Henry of Huntingdon ( la, Henricus Huntindoniensis; 1088 – AD 1157), the son of a canon in the diocese of Lincoln, was a 12th-century English historian and the author of ''Historia Anglorum'' (Medieval Latin for "History of the English"), ...
's ''History of the English'' identified Constantius's wife Helen as British and
Geoffrey of Monmouth Geoffrey of Monmouth ( la, Galfridus Monemutensis, Galfridus Arturus, cy, Gruffudd ap Arthur, Sieffre o Fynwy; 1095 – 1155) was a British cleric from Monmouth, Wales and one of the major figures in the development of British historiography ...
repeated the claim in his 1136 '' History of the Kings of Britain''. Geoffrey related that Constantius was sent to Britain by the
Senate A senate is a deliberative assembly, often the upper house or chamber of a bicameral legislature. The name comes from the ancient Roman Senate (Latin: ''Senatus''), so-called as an assembly of the senior (Latin: ''senex'' meaning "the e ...
after Asclepiodotus (here a British king) was overthrown by Coel of
Colchester Colchester ( ) is a city in Essex, in the East of England. It had a population of 122,000 in 2011. The demonym is Colcestrian. Colchester occupies the site of Camulodunum, the first major city in Roman Britain and its first capital. Col ...
. Coel submitted to Constantius and agreed to pay tribute to Rome, but died only eight days later. Constantius married his daughter Helena and became king of Britain. He and Helena had a son, Constantine, who succeeded to the throne of Britain when his father died at
York York is a cathedral city with Roman origins, sited at the confluence of the rivers Ouse and Foss in North Yorkshire, England. It is the historic county town of Yorkshire. The city has many historic buildings and other structures, such as ...
eleven years later. These accounts have no historical validity: Constantius had divorced Helena before he went to Britain. Similarly, the ''
History of the Britons ''The History of the Britons'' ( la, Historia Brittonum) is a purported history of the indigenous British ( Brittonic) people that was written around 828 and survives in numerous recensions that date from after the 11th century. The ''Historia B ...
'' traditionally ascribed to
Nennius Nennius – or Nemnius or Nemnivus – was a Welsh monk of the 9th century. He has traditionally been attributed with the authorship of the ''Historia Brittonum'', based on the prologue affixed to that work. This attribution is widely considered ...
Nennius Nennius – or Nemnius or Nemnivus – was a Welsh monk of the 9th century. He has traditionally been attributed with the authorship of the ''Historia Brittonum'', based on the prologue affixed to that work. This attribution is widely considered ...
().
Theodor Mommsen Christian Matthias Theodor Mommsen (; 30 November 1817 – 1 November 1903) was a German classical scholar, historian, jurist, journalist, politician and archaeologist. He is widely regarded as one of the greatest classicists of the 19th centu ...
(). ''Historia Brittonum''. Composed after AD 830. Hosted at Latin Wikisource.
claims the inscribed tomb of "Constantius the Emperor" was still present in the 9th century in the Roman fort of
Segontium Segontium ( owl, Cair Segeint) is a Roman fort on the outskirts of Caernarfon in Gwynedd, North Wales. The fort, which survived until the end of the Roman occupation of Britain, was garrisoned by Roman auxiliaries from present-day Belgium and G ...
(near present-day
Caernarfon Caernarfon (; ) is a royal town, community and port in Gwynedd, Wales, with a population of 9,852 (with Caeathro). It lies along the A487 road, on the eastern shore of the Menai Strait, opposite the Isle of Anglesey. The city of Bangor is ...
, in
North Wales , area_land_km2 = 6,172 , postal_code_type = Postcode , postal_code = LL, CH, SY , image_map1 = Wales North Wales locator map.svg , map_caption1 = Six principal areas of Wales commonl ...
).Newman, John Henry & al
p. 92.">''Lives of the English Saints: St. German, Bishop of Auxerre'', Ch. X: "Britain in 429, A. D.", p. 92.
James Toovey (London), 1844.
David Nash Ford credited the monument to Constantine, the supposed son of Magnus Maximus and Elen, who was said to have ruled over the area prior to the Irish invasions.Ford, David Nash.
The 28 Cities of Britain
" at Britannia. 2000.


Notes


Sources


Ancient sources

*
Aurelius Victor Sextus Aurelius Victor (c. 320 – c. 390) was a historian and politician of the Roman Empire. Victor was the author of a short history of imperial Rome, entitled ''De Caesaribus'' and covering the period from Augustus to Constantius II. The work ...

''Epitome de Caesaribus''
*
Zosimus Zosimus, Zosimos, Zosima or Zosimas may refer to: People * * Rufus and Zosimus (died 107), Christian saints * Zosimus (martyr) (died 110), Christian martyr who was executed in Umbria, Italy * Zosimos of Panopolis, also known as ''Zosimus Alchem ...

''Historia Nova''


Modern sources

* *Southern, Pat. ''The Roman Empire from Severus to Constantine'', Routledge, 2001 *Potter, David Stone, ''The Roman Empire at Bay, AD 180–395'', Routledge, 2004 * * * DiMaio, Robert,

, ''De Imperatoribus Romanis'', 1996 * *


References


External links

{{Authority control 3rd-century births 306 deaths 3rd-century Roman consuls 4th-century Roman consuls 3rd-century Roman emperors 4th-century Roman emperors Ancient Romans in Britain British traditional history Caesars (heirs apparent) Constantinian dynasty Deified Roman emperors Equestrian commanders of vexillationes Flavii Illyrian people Tetrarchy Illyrian emperors