** Battle of Lingones — Caesar Constantius Chlorus defeats the Alemanni

Soon after his father's death Constantius is supposed to have ordered a massacre of his relatives descended from the second marriage of his paternal grandfather Constantius Chlorus, though the details are unclear.

In 293, Constantius Chlorus launched a second offensive, besieging the rebel's port at Boulogne and cutting it off from naval assistance.

Constantius Chlorus returned in 306, aiming to invade northern Britain.

His paternal grandparents were Western Roman Emperor Constantius Chlorus and his second wife, Flavia Maximiana Theodora.

Constantius II ordered the murders of many descendants from the second marriage of Constantius Chlorus and Theodora, leaving only Constantius and his brothers Constantine II and Constans I, and their cousins, Julian and Gallus ( Julian's half-brother ), as the surviving males related to Emperor Constantine.

* 293 – Roman Emperors Diocletian and Maximian appoint Constantius Chlorus as Caesar to Maximian.

* 250 – Constantius Chlorus, Roman Emperor ( d. 306 )

In 293, feeling more focus was needed on both civic and military problems, Diocletian, with Maximian's consent, expanded the imperial college by appointing two Caesars ( one responsible to each Augustus ) — Galerius and Constantius Chlorus.

* Augusta Treverorum ( modern Trier, in Germany ) was the capital of Constantius Chlorus, the western Caesar, near the strategic Rhine border, it had been the capital of Gallic emperor Tetricus I ; this quarter became the prefecture Galliae.

Their Caesares, Galerius and Constantius Chlorus, were both raised to the rank of Augustus, and two new Caesares were appointed: Maximinus ( Caesar to Galerius ) and Flavius Valerius Severus ( Caesar to Constantius ).

:: Gallia et Hispaniae Constantius Chlorus ( 293 – 305 )

:: Gallia, Hispaniae et Britannia Constantius Chlorus ( 305 – 306 )

The first book sketches briefly the history of the early Roman emperors from Augustus to Diocletian ( 305 ); the second, third and fourth deal more fully with the period from the accession of Constantius Chlorus and Galerius to the death of Theodosius I ; the fifth and sixth, the most useful for historians, cover the period between 395 and 410, when Priscus Attalus was deposed ; for this period, he is the most important surviving non-ecclesiastical source.

* Constantius Chlorus and Galerius are declared Augusti ; Flavius Valerius Severus and Maximinus II Daia are appointed Caesars.

Constantius Chlorus requests leave for his son Constantine I who remains at Galerius's court in Nicomedia, as a virtual hostage.

* Battle of Lingones: Constantius Chlorus defeats the Alamanni in the territory of the Lingones ( Langres ) in Gaul.

* Constantius Chlorus defeats the Alemanni and fortifies the town of Konstanz ( Germany ).

Medal of Constantius Chlorus capturing Roman London | Londinium ( 296 )

* Constantius Chlorus reconquers Britain, he rebuilds the cities Eboracum ( York ), Londinium ( London ), and Verulamium ( St Albans ).

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.

The massacre killed two of Constantius ' uncles and six of his cousins, including Hannibalianus and Dalmatius, rulers of the Pontus and Moesia respectively.

Meanwhile, his brother Constantine desired to retain control of Constans ' realm – leading Constantius ' two brothers into open conflict.

Despite rejecting these terms, Constantius still tried to avert war with the Sassanid Empire by sending two embassies to Shapur II.

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.

However, Constantius died before the two could face each other in battle, naming Julian as his rightful successor.

They in turn appointed two new Caesars — Severus II in the west under Constantius, and Maximinus in the east under Galerius — thereby creating the second Tetrarchy.

Constantius was the more senior of the two Caesars, and on official documents he always took precedence, being mentioned before Galerius.

Constantius spent the next two years neutralising the threat of the Franks who were the allies of Allectus, as northern Gaul remained under the control of the British usurper until at least 295.

When Valentinian was less than two years old, Honorius appointed Constantius co-emperor, a dignity he would hold until his death seven months later.

Comparing this material with Constantius of Lyon ' Life of St. Germanus of Auxerre, it suggests that the two are not the same person.

After his death in 337, two of his sons, Constantius II and Constans, took over the leadership of the empire and re-divided their Imperial inheritance.

Fausta, as Salus, holding her two sons, Constantine II ( emperor ) | Constantine II and Constantius II.

Emperors Constans and Constantius, the two remaining sons of Constantine worked together at the urging of Pope Julius in response to this heresy that not only divided the church, but the state as well.

In 357 he recited in the senate of Constantinople two orations in honour of Constantius, which were intended to have been delivered before the emperor himself, who was then at Rome.

The couple soon had two children, Honoria and Valentinian III, and Constantius was elevated to the position of Augustus in 420.

Given the circumstances at the time Constantius may well have divided the military command of Britannia Superior in two with an eastern province named Britannia Caesariensis and a western one named Britannia Prima.

Given the circumstances at the time Constantius may well have divided the military command of Britannia Superior in two with an eastern province named Britannia Caesariensis and a western one named Britannia Prima.

At two councils in 359 ( Rimini in the West and Seleucia in the East ), Constantius tried to impose Sirmium IV's homoios formula on the church.

Constantius I " Chlorus " married twice ; his first wife St. Helena bore him a son, Constantine I whose second wife Fausta ( daughter of Maximian and Eutropia ; sister of Maxentius ; half-sister of Constantius I's second wife Theodora ) bore him three sons ( Constantine II, Constantius II, and Constans I ) and two daughters ( Constantia and Helena ); these children were nieces and nephews of Maxentius, half-nieces and half-nephews of Licinius ( who had married their father's half-sister ), and grandchildren of Maximian.

Ultimately, Constantius was able to push back the invasion, Shapur failing to make any significant gains.

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

* An invasion of Pannonia by the Quadi and the Sarmates is repulsed by Constantius II.

Constantius launched an invasion to depose him in September 296.

The phenomenon recurred in the mid-fourth century in the reign of Constantius, in conjunction with an invasion of the Alemanni.

In 354 AD the Roman Emperor, Constantius II stationed the Roman 7th Army in Chalon ( then called Cabyllona ) for an invasion against the brother kings, Gundomad and Vadomar of the Alamanni.

Allectus, having assassinated Carausius in 293, remained in control of Britain until 296, when Constantius staged an invasion to retake the island.

In 413 he led an invasion of Italia, lost to a subordinate of Constantius, and fled back to Africa where he was murdered by Constantius's agents.