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Magnus Maximus
Usurper of the Western Roman Empire
Reign	383 - August 28, 388 (against Gratian, then Valentinian II and Theodosius I)
Born	ca. 335
	Hispania
Died	August 28, 388
	Aquileia
Wife/wives	Helen?
Issue	Flavius Victor, two daughters

Magnus Maximus (ca. 335–August 28, 388), also Maximianus, was an usurper of the Western Roman Empire from 383 until his death, in 388, by order of Emperor Theodosius I.

Maximus was proclaimed emperor by his troops in 383 while serving with the army in Britain. He went to Gaul to pursue his imperial ambitions. Following his destruction of Gaul, Maximus went out to meet his main opponent, Gratian, whom he defeated near Paris. Gratian, after fleeing, was killed at Lyon on August 25, 383. Soon after, Maximus managed to force Valentinian II out of Rome after which he fled to Theodosius I, the Eastern Roman Emperor. Maximus made his capital at Augusta Treverorum (Treves, Trier) in Gaul. He became a popular emperor, although also a stern persecutor of heretics.

Theodosius I and Valentinian II campaigned against Magnus Maximus in July-August 388. Maximus was defeated in the Battle of the Save, and retreated to Aquileia.

Andragathius, magister equitum of Maximus and killer of Gratian, was defeated near Siscia, his brother Marcellinus again at Poetovio. Maximus surrendered in Aquileia and although pleaded for mercy was executed. However, his wife and two daughters were spared. Maximus' son, Flavius Victor, was defeated and executed by Valentinian's magister peditum Arbogast in the fall of the same year. What happened to his family is not related, although it is clear that they survived and that his descendants continued to occupy influential posts. We encounter a possible daughter of Magnus Maximus, Sevira, on the Pillar of Eliseg, an early medieval inscribed stone in Wales which claims her marriage to Vortigern, king of the Britons. Another daughter was possibly married to Ennodius, proconsul Africae (395). Their grandson was Petronius Maximus, who was another ill-fated emperor, ruling in Rome for but 77 days before he was stoned to death while fleeing from the Vandals on May 24, 455. Other descendants included Anicius Olybrius, emperor in 472, but also several consuls and bishops such as St. Magnus Felix Ennodius (Bishop of Pavia c. 514-21).

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The Dream of Maxen Wledig

According to Geoffrey of Monmouth's fictional Historia regum Britanniae, basis for many English and Welsh legends, Magnus (Welsh: Macsen Wledig) was king of the Brythons following the death of Octavius and a nephew of King Coel through his brother Ioelinus. According to the Mabinogion tale The Dream of Macsen Wledig, Magnus Maximus took as his wife Helen or Elen, daughter of a chieftain based at Segontium (Caernarfon). This agrees with the story Geoffrey tells that Octavius, the king of the Britons, wanted to wed his daughter to a powerful half-Roman, half-Briton and give the kingship of Britain as a dowry to that husband.

Although the story of their meeting is almost certainly fictional, there is some evidence for the basic claims. Caradocus, the Duke of Cornwall, supported the marriage between Octavius's daughter and Maximus. Maximus accepted and left Rome for Britain. Geoffrey claims further that Maximus gathered an army as he sacked Frankish towns along the way. He invaded Clausentum (modern Southampton) unintentionally and nearly fought the army of the Britons before a truce was made. Following further negotiations, Maximus was given the kingship of Britain and Octavius retired. Welsh legend also claims that he was responsible for the withdrawal of Roman troops from Wales, twenty years before the rest of Britain was left to govern itself. Five years into his kingship, Magnus Maximus assembled a vast fleet and invaded Gaul, leaving Britain in the control of Caradocus. Upon reaching the kingdom of Armorica, he defeated the king and killed thousands of inhabitants. Before departing, he summoned Conanus (Welsh: Kynan Meriadec, French: Conan Meriadoc), the rebellious nephew of Octavius, and asked him to rule as king of the land, which was renamed Brittany, or 'Little Britain'.

• Pillar of Eliseg

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Magnus Maximus

• De Imperatoribus Romanis account
• "Roman Empire" account

• Translated text of "The Dream of Macsen Wledig", included in The Mabinogion