Maximus was a distinguished general who served under Theodosius the Elder. He certainly served with him in Africa in 373 and on the Danube in 376. It is likely he also may have been a junior officer in Britain during the quelling of the Great Conspiracy in 368. Assigned to Britain in 380, he defeated an incursion of the Picts and Scots in 381. Maximus was proclaimed emperor by his troops in 383. He went to Gaul to pursue his imperial ambitions taking a large number of British troops with him.
Following his conquest 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. Continuing his campaign into Italy Maximus was stopped from overthrowing Valentinian II, who was aged only twelve, when Theodosius I, the Eastern Roman Emperor, sent Flavius Bauto with a powerful force to stop him. Negotiations followed in 384 including the intervention of Ambrose, Bishop of Milan, leading to an accord with Valentinian II and Theodosius I in which Maximus was recognized as an Augustus in the west.
Maximus made his capital at Augusta Treverorum (Treves, Trier) in Gaul and ruled Britain, Gaul, Spain, and Africa. He issued coinage and a number of edicts reorganizing Gaul's system of provinces. Some scholars believe Maximus may have founded the office of the Comes Britanniarum as well. He became a popular emperor, Quintus Aurelius Symmachus delivered a panegyric on Maximus' virtues. He used barbarian forces such as the Alamanni to great effect. He was also a stern persecutor of heretics. It was on his orders that Priscillian and 6 companions became the first people in the history of Christianity to be executed for heresy, in this case of Priscillianism, by other Christians (though the civil charges were for the practice of magic), and their property was confiscated. These executions went ahead despite the wishes of prominent men such as St. Martin of Tours. Maximus' edict of 387 or 388 which censured Christians at Rome for burning down a Jewish synagogue, was condemned by Bishop Ambrose who said people exclaimed: ‘the emperor has become a Jew’
In 387 Maximus managed to force Valentinian II out of Rome after which he fled to Theodosius I. Theodosius I and Valentinian II then invaded from the east and campaigned against Magnus Maximus in July-August 388 their troops being led by Richomeres and other generals. Maximus was defeated in the Battle of the Save, and retreated to Aquileia. Meanwhile the Franks under Marcomer had taken the opportunity and invaded at the same time further weakening Maximus' position.
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. The Senate passed a decree of Damnatio memoriae against him. 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).
Role in British and Breton History
In Gildas's De Excidio et Conquestu Britanniae written in the sixth century Maximus is attributed an important role as the man responsible for withdrawing Roman troops from Britain on a major scale and thus leaving it open to barbarian attack. The archaeological evidence backs up Gildas's account in that the late fourth century seems to have been the period when Roman troops were withdrawn from areas like Hadrian's Wall and Segontium with no coins found later than 383. The earliest Welsh genealogies give Maximus (Welsh: Macsen/Maxen Wledig) a role as a founding father of the dynasties of many of Welsh kingdoms such as the Kingdom of Powys, Kingdom of Gwent and the Kingdom of Dyfed the sort of claims reflected in the Pillar of Eliseg and in lists of the Fifteen Tribes of Wales. It has been argued that this role may be a result of genuine land grants and delegation of authority by Roman authorities to local leaders such as Vortigern and Padarn Beisrudd on troop withdrawal. It also has been suggested he settled the Déisi and Attacotti in Britain. Although it is impossible to back these ideas with any certainty, and they could be later invention what is obvious that a connection to Macsen was seen as highly desirable early in Welsh history.
The ninth century Historia Brittonum gives another account of Maxiumus and assigns him an important role:
The seventh emperor was Maximianus. He withdrew from Britain with all its military force, slew Gratianus the king of the Romans, and obtained the sovereignty of all Europe. Unwilling to send back his warlike companions to their wives, families, and possessions in Britain, he conferred upon them numerous districts from the lake on the summit of Mons lovis, to the city called Cant Guic, and to the western Tumulus, that is Cruc Occident. These are the Armoric Britons, and they remain there to the present day. In consequence of their absence, Britain being overcome by foreign nations, the lawful heirs were cast out, till God interposed with his assistance.
Modern historians believe that this idea of mass British troop settlement in Brittany by Maximus may very well reflect some reality as it accords with other historical evidence and later Breton traditions.
