Constantius Chlorus (Constantius) Augustus
Privacy Level: Open (White)

Marcus Flavius Valerius Herculius (Constantius) Augustus (0250 - 0306)

Marcus Flavius Valerius Herculius (Constantius Chlorus) Augustus formerly Constantius
Born in Dardania, Moesia Superior (now Serbia)map
Son of [father unknown] and [mother unknown]
[sibling(s) unknown]
Husband of — married [date unknown] (to 0293) [location unknown]
Husband of — married 0293 in Rome, Roman Empiremap
Descendants descendants
Died in Eboricum, Brittania (now York, England)map
Profile last modified | Created 21 Mar 2011
This page has been accessed 6,366 times.




  • Marcus Flavius Valerius Constantius Herculius Augustus (31 Mar c.250 Serbia – 25 July 306)
  • Constantius Chlorus

250 Birth

Constantius I (Latin: Marcus Flavius Valerius Constantius Herculius Augustus;[2][3] 31 March c. 250 – 25 July 306), commonly known as Constantius Chlorus (Greek: Κωνστάντιος Χλωρός, Kōnstantios Khlōrós, literally "Constantius the Pale"), was Caesar, a form of Roman co-emperor, from 293 to 306.[4] He was the father of Constantine the Great and founder of the Constantinian dynasty. [1]


Born in Dardania, Constantius was the son of Eutropius, whom the Historia Augusta claimed to be a nobleman from northern Dardania, in the province of Moesia Superior. [1]

Conventional accounts give his mother's name as Claudia, a niece of the emperors Claudius II and Quintillus[6] Modern historians suspect this maternal connection to be a genealogical fabrication created by his son Constantine I,[7] and that his family were of humble origins[1]

First Marriage to Helena

He was first married to Helena but required to divorce her in 293. [2]

292 Second Marriage to Theodora

He married secondly, in 293 and until 306, Theodora (Flavia Maximiana Theodora)[3]

293 Governor of Dalmatia

Governor of Dalmatia, appointed Caesar to rule Gaul and Britain March 1, 293.

305 Emperor

Emperor of the Western Roman Empire, father of Constantine the Great, founder of the Constantinian dynasty.

Constantius I became Emperor of Rome in May 305, and in right of his wife, King of England. He was born in 242 and died at Eboracum (present day York, England) on July 25, 306. On becoming "Caesar," he was required by Diocletian to put aside *Helena and to take Maximian's stepdaughter, Theodora, as his wife. From the first union, *Helena and *Constantius I had an illegitimate son, *Constantine the Great. He married (2) Theodora, daughter of Maximinus, Roman Emperor.

Constantius I, called Constantius Chlorus, Roman emperor (305-06). He was a general and administrator under Emperor Maximian, who adopted him and gave him the government of Gaul and the rank of Caesar in 293. When his co emperors, Maximian and Diocletian, abdicated in 305, Constantius became emperor in the West and prepared to conquer the Picts of Scotland.He died during the campaign, after proclaiming his son, Constantine the Great, his successor as emperor.

306 Death

Constantius died suddenly in Eburacum (York) in 306. As he was dying, Constantius recommended his son to the army as his successor; consequently Constantine was declared emperor by the legions at York. His death sparked the collapse of the tetrarchic system of government inaugurated by the Emperor Diocletian.

Research Notes

Notice of ambiguous parentage

Born in Dardania[4], the Historia Augusta[5] claimed Constantius was the son of Eutropius, a noble from northern Dardania, in the province of Moesia Superior (roughly today's Serbia), and Claudia, a niece of the emperors Claudius II and Quintillus.

Modern historians suspect the maternal connection to Claudia to be a genealogical fabrication created by his son Constantine I[6], and that Constantius' family were of humble origins.[7]

Constantius' father, however, might have been the brother of Eutropia, wife of Maximian.

Gibbon stated that Claudia was the niece of Claudius II (Marcus Aurelius Flavius Claudius Gothicus).

Encyclopedia Brittanica maintains Constantius I's descent from Claudius Gothicus was a fiction.

Roman Helen and Welsh Elen

Wikipedia states that "Constantius was ... remembered in medieval Welsh legend, which confused his family with that of Magnus Maximus, also said to wed a Saint Elen and sired a son named Constantine while in Britain.

Henry of Huntingdon, Historia Anglorum

Henry of Huntingdon's, "History of the English" identified Constantius's wife Helen as British.

Huntingdon's history is apparently the origin of a pedigree appearing in Richard Morgan's 1861 book, St. Paul in Britain, discussed in more detail at Space: From Beli to Byzantine.

1136 Geoffrey of Monmouth

Geoffrey of Monmouth repeated the claim in his 1136 "History of the Kings of Britain". Geoffrey related that Constantius was sent to Britain by the Senate after Asclepiodotus (here a British king) was overthrown by Coel of Colchester. Coel submitted to Constantius and agreed to pay tribute to Rome, but died only eight days later. Constantius married Coel's 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 (Eboricum) eleven years later. These accounts have no historical validity: Constantius had divorced Helena before he went to Britain.


Similarly, the "History of the Britons," traditionally ascribed to Nennius mentions that the inscribed tomb of "Constantius the Emperor" was still present in the 9th century in Segontium (near present-day Caernarfon, Wales).

Ford credited the monument to Constantine, supposed son of Magnus Maximus and Elen, said to have ruled over the area prior to the Irish invasions." [8]


  1. 1.0 1.1 1.2 Wikipedia: Constantius Chlorus
  2. Wikipedia: Helena (empress)
  3. Wikipedia: Flavia Maximiana Theodora
  6. Southern, Pat. The Roman Empire from Severus to Constantine, Routledge, 2001
  7. Jones, A.H.M., Martindale, J.R. The Prosopography of the Later Roman Empire, Vol. I: AD260-395, Cambridge University Press, 1971
  8. [1]

See also:

  • Barnes, T.D . Constantine and Eusebius, , Cambridge, 1980.
  • New Empire of Diocletian and Constantine . Cambridge, 1981.
  • DiMaio, Michael. Zonaras' Account of the Neo-Flavian Emperors , (Ph.D. diss., University of Missouri-Columbia, 1977).
  • Jones, A.H.M. J.R. Martindale, and J. Morris. "Fl. Val. Constantius 12." the Prosopography of the Later Roman Empire , (Cambridge, 1971), 1.227-228.
  • Kienast, Dietmar. Römische Kaisertabelle: Grundzüge einer römischen Kaiserchronologie . Darmstadt, 1990.
  • MacMullen, R. Constantine , New York, 1969.
  • Mattingly, Harold, and B.H. Warmington ."Constantius (Chlorus)." OCD .2281-282.
  • Seeck, Otto. "Constantius 1." RE 4, col.1040ff.

1 Constantius' full name: ILS , 630, 641-3, 648, 650-52; such variations as Marcus Flavius Valerius Constantius( ibid , 637), Valerius Constantius ( ibid. , 640), Gaius Valerius Constantius ( ibid , 649), and Gaius Fabius Constantius ( ibid. , 650a) appear on inscriptions.

Constantius' date of birth, homeland, and career: Michael DiMaio, Zonaras' Account of the Neo-Flavian Emperors: A Commentary , (Ph.D diss., University of Missouri-Columbia, 1977), 97-98, nn 11-14; Constantius as Maxiamianus' Praetorian prefect: T.D. Barnes, Constantine and Eusebius, , (Cambridge, 1980), 3, 7-8, New Empire of Diocletian and Constantine , (Cambridge, 1981), 36-37.

For a discussion of Constantius' marriage to Helen, see infra , n.2.

2 For a listing of the sources on the dating Constantius rise to the rank of Caesar, see A.H.M. Jones, J.R. Martindale, and J. Morris, the Prosopography of the Later Roman Empire , (Cambridge, 1971), s.v. "Fl. Val. Constantius 12," 1.227-228, and Dietmar Kienast, Römische Kaisertabelle , (Darmstadt, 1990), 276ff

The Caesarship of Constantius is discussed, for example, by O. Seeck, RE 4, s.v. "Constantius 1," col.1041.57ff, and Ramsey MacMullen, Constantine , (New York, 1969), 35ff.

Barnes has summarized the problems and the sources surrounding the marriages of Constantius to Helen and to Theodora ( New Empire ), 33, 36-37.

3 Constantius' campaigns are discussed by Barnes, Constantine and Eusebius , 15ff, and by Harold Mattingly and B.H. Warmington, OCD ,2s.v ."Constantius (Chlorus)," 281-282.

4 Lact., Mort. Pers. , 15.7

5 For a listing of sources which treat the acclamation of Constantius to the rank of Augustus, see Barnes, New Empire , 4ff.

6 For a discussion of the death of Constantius and the sources that treat it, see DiMaio, 96ff.

More Genealogy Tools

Sponsored Search

Is Constantius Chlorus your ancestor? Please don't go away!
 star icon Login to collaborate or comment, or
 star icon contact private message private message private message private message a profile manager, or
 star icon ask our community of genealogists a question.
Sponsored Search by

No known carriers of Constantius Chlorus's DNA have taken a DNA test.

Have you taken a DNA test? If so, login to add it. If not, see our friends at Ancestry DNA.

Comments: 3

Leave a message for others who see this profile.
There are no comments yet.
Login to post a comment.
Constantius-11 and Constantius-4 appear to represent the same person because: Same historical person.
posted by Marty (Lenover) Acks
He was part of the Global reunion project by 43 Degrees.
posted by Matt Pryber
I have the information that was posted in the memories section in a doc file if you need it. The biography looks very complete, though. It should be incorporated into the biography rather than put in memories, if you do decide to use it. It needed deleted in order to restore the page formatting. I can email it if one of you want it.

Thanks! Abby

posted by Abby (Brown) Glann

Constantius Chlorus is 56 degrees from Ludwig Kraayenbrink, 37 degrees from Henry VIII of England and 56 degrees from Ferdinand von Zeppelin on our single family tree. Login to find your connection.

C  >  Constantius  |  A  >  Augustus  >  Marcus Flavius Valerius Herculius (Constantius) Augustus

Categories: EuroAristo - Profiles that need work | Roman History