In 421, Honorius recognized him as co-emperor Constantius III ; however, when the announcement of his elevation was sent to Constantinople, Theodosius refused to recognise him.

The following year, however, the Eastern Emperor Theodosius II elected his cousin Valentinian III, son of Galla Placidia and Constantius III, as Emperor.

* 421 – Constantius III becomes co-Emperor of the Western Roman Empire.

She was consort to Ataulf king of the Goths from 414-415 until his death, and Empress consort to Constantius III from 417-422 until his death.

Both the Empress Galla Placidia and her husband Constantius III favored Eulalius, who had been elected first.

* 421 – Galla Placidia, wife of the Emperor Constantius III, becomes a widow for the second time when he dies suddenly of an illness.

Solidus ( coin ) | Solidus of Emperor Constantius III

* February 8 – Constantius III is appointed co-emperor ( Augustus ) with his ineffectual brother-in-law, Honorius, and becomes the real ruler of the Western Roman Empire.

* September 2 – Constantius III dies suddenly of an illness, his wife Galla Placidia becomes for the second time a widow.

* September 2 – Constantius III, emperor of the Western Roman Empire

Flavius Constantius ( died 2 September 421 ), commonly known as Constantius III, was Western Roman Emperor for seven months in 421.

Consular diptych of Constantius III, produced for his consulate in 413 or 417.

* Elton, Hugh, " Constantius III ( 421 A. D .)", De Imperatoribus Romanis

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The Roman Emperors Constantius II ( 337 – 361 ) and Valens ( 364 – 378 ) were Arians or Semi-Arians.

However, to minimize the extent of the movement ignores the facts that at least two Roman emperors, Constantius II and Valens, became Arians, as did prominent Gothic, Vandal and Lombard warlords both before and after the fall of the Western Roman Empire.

* 317 – Constantius II, Roman emperor ( d. 361 )

* 355 – Claudius Silvanus, accused of treason, proclaims himself Roman Emperor against Constantius II.

In May 357 the Roman laity, which had remained faithful to Liberius, demanded that Constantius, who was on a visit to Rome, should recall Liberius.

Shortly thereafter, however, Constantine's son, the new Roman Emperor Constantius II, renewed the order for Athanasius ' banishment in 338.

The Batavi were still mentioned in 355 during the reign of Constantius II ( 317-361 ), when their island was already dominated by the Salii, a Frankish tribe that had sought Roman protection there in 297 after having been expelled from their own country by the Saxons.

* Constantius II ( 317 – 361 ), Roman Emperor from 337 to 361

Constantius II (; 7 August 317 – 3 November 361 ), was Roman Emperor from 337 to 361.

Division of the Roman Empire among the Caesars appointed by Constantine I: from left to right, the territories of Constantine II ( emperor ) | Constantine II, Constans I, Dalmatius and Constantius II.

While Constantius was away from the eastern frontier in early 337, Shapur assembled a large army, including war elephants, and launched an attack on Roman territory, laying waste to Mesopotamia and putting Nisibis under siege.

When Constantius learned of Shapur's withdrawal from Roman territory, he prepared his army for a counter-attack, drilling them and upgrading the equipment of his cataphracts.

The defeat of Magnentius in 353 left Constantius as sole Roman Emperor.

As a result of Constantius ' rejection of his terms, Shapur II launched another invasion of Roman Mesopotamia.

Constantius seems to have had a particular interest in the religious state of the Roman Empire.

As a Christian Roman Emperor, Constantius made a concerted effort to promote Christianity at the expense of Roman polytheism (‘ paganism ’).

In spite of the some of the edicts issued by Constantius, it should be recognised that he was not fanatically anti-pagan – he never made any attempt to disband the various Roman priestly colleges or the Vestal Virgins, he never acted against the various pagan schools, and, at times, he actually made some effort to protect paganism.

:* The Abinnaeus Archive: Papers of a Roman Officer in the Reign of Constantius II ( in Greek ).

* This list of Roman laws of the fourth century shows laws passed by Constantius II relating to Christianity.

With Constantine ’ s death in 337, Constans and his two brothers, Constantine II and Constantius II divided the Roman world between themselves, after first deposing of virtually all of the relatives of their father who could possibly have a claim on the throne.

Division of the Roman Empire among the Caesars appointed by Constantine I: from left to right, the territories of Constantine II ( emperor ) | Constantine II, Constans, Dalmatius and Constantius II.

Division of the Roman Empire among the Caesars appointed by Constantine I: from left to right, the territories of Constantine II, Constans I, Dalmatius and Constantius II.

He was so influential that even after his death, Constantius II heeded his and Eudoxus of Constantinople's advice to attempt to convert the Roman Empire to Arianism by creating Arian Councils and official Arian Doctrines.