Maximian (; ), nicknamed Herculius, was Roman emperor from 286 to 305. He was Caesar from 285 to 286, then Augustus from 286 to 305. He shared the latter title with his co-emperor and superior, Diocletian, whose political brain complemented Maximian's military brawn. Maximian established his residence at Trier but spent most of his time on campaign. In late 285, he suppressed rebels in Gaul known as the Bagaudae. From 285 to 288, he fought against Germanic tribes along the Rhine frontier. Together with Diocletian, he launched a scorched earth campaign deep into Alamannic territory in 288, refortifying the frontier.

The man he appointed to police the Channel shores, Carausius, rebelled in 286, causing the secession of Britain and northwestern Gaul. Maximian failed to oust Carausius, and his invasion fleet was destroyed by storms in 289 or 290. Maximian's subordinate Constantius campaigned against Carausius' successor, Allectus, while Maximian held the Rhine frontier. The rebel leader was ousted in 296, and Maximian moved south to combat piracy near Hispania and Berber incursions in Mauretania. When these campaigns concluded in 298, he departed for Italy, where he lived in comfort until 305. At Diocletian's behest, Maximian abdicated on 1 May 305, gave the Augustan office to Constantius, and retired to southern Italy.

In late 306, Maximian took the title of Augustus again and aided his son, Maxentius, and his rebellion in Italy. In April 307, he attempted to depose his son, but failed and fled to the court of Constantius' successor, Constantine (Maximian's step-grandson and son-in-law), in Trier. At the Conference of Carnuntum in November 308, Diocletian and his successor, Galerius, forced Maximian to renounce his imperial claim again. In early 310, Maximian attempted to seize Constantine's title while the emperor was on campaign on the Rhine. Few supported him, and he was captured by Constantine in Marseille. Maximian killed himself in mid-310 on Constantine's orders. During Constantine's war with Maxentius, Maximian's image was purged from all public places. However, after Constantine ousted and killed Maxentius, Maximian's image was rehabilitated, and he was deified.

Early life

Maximian was born around the year 250 near Sirmium (modern Sremska Mitrovica, Serbia) in the province of Pannonia, into a family of shopkeepers. Beyond that, the ancient sources contain vague allusions to Illyricum as his homeland, to his Pannonian virtues, and to his harsh upbringing along the war-torn Danube frontier. Maximian joined the army, serving with Diocletian under the emperors Aurelian (r. 270–275) and Probus (r. 276–282). He probably participated in the Mesopotamian campaign of Carus in 283 and attended Diocletian's election as emperor on 20 November 284 at Nicomedia. Maximian's swift appointment by Diocletian as Caesar is taken by the writer Stephen Williams and historian Timothy Barnes to mean that the two men were long-term allies, that their respective roles were pre-agreed and that Maximian had probably supported Diocletian during his campaign against Carinus (r. 283–285) but there is no direct evidence for this.

With his great energy, firm aggressive character and disinclination to rebel, Maximian was an appealing candidate for imperial office. The fourth-century historian Aurelius Victor described Maximian as "a colleague trustworthy in friendship, if somewhat boorish, and of great military talents".Victor, Liber de Caesaribus 39, quoted in Despite his other qualities, Maximian was uneducated and preferred action to thought. The panegyric of 289, after comparing his actions to Scipio Africanus' victories over Hannibal during the Second Punic War, suggested that Maximian had never heard of them.Panegyrici Latini 10(2), quoted in His ambitions were purely military; he left politics to Diocletian. The Christian rhetor Lactantius suggested that Maximian shared Diocletian's basic attitudes but was less puritanical in his tastes, and took advantage of the sensual opportunities his position as emperor offered. Lactantius charged that Maximian defiled senators' daughters and traveled with young virgins to satisfy his unending lust, though Lactantius' credibility is undermined by his general hostility towards pagans.Lactantius, De mortibus persecutorum 8, quoted in

Maximian had two children with his Syrian wife, Eutropia: Maxentius and Fausta. There is no direct evidence for their birthdates. Maxentius was probably born around 283 (when Maximian was in Syria), and Fausta around 289 or 290. Maximiana Theodora, the wife of Constantius, is often called Maximian's stepdaughter by ancient sources, leading to claims by Otto Seeck and Ernest Stein that she was born from an earlier marriage between Eutropia and Afranius Hannibalianus.Aurelius Victor, de Caesaribus 39.25; Eutropius, Breviaria 9.22; Jerome, Chronicle 225g; Epitome de Caesaribus 39.2, 40.12, quoted in Barnes challenges this view, saying that all "stepdaughter" sources derive their information from the partially unreliable work of history Kaisergeschichte, while other, more reliable, sources refer to her as Maximian's natural daughter.Origo Constantini 2; Philostorgius, Historia Ecclesiastica 2.16a, quoted in . See also Panegyrici Latini 10(2)11.4. Barnes concludes that Theodora was born no later than c. 275 to an unnamed earlier wife of Maximian, possibly one of Hannibalianus' daughters. Julia Hillner agrees with Barnes that the "stepdaughter sources" are a result of political propaganda from the later Constantinian dynasty but believes that Barnes explanation fails to explain why Theodora named one of her daughters Eutropia if her mother was an unknown Afrania instead of empress Eutropia. Hillner argues that Afranius Hannibalianus was Eutropia's brother and that Theodora was the daughter of both Maximian and Eutropia. This is in line with John Vanderspoel.

Appointment as Caesar At Mediolanum (Milan, Italy) probably in July 285, Diocletian appointed Maximian as his heir-apparent and subordinate, with the title Caesar.The event has been dated to both 21 July (; ; ) and 25 July (). On the whole debate, see . Another likely date is 13 December 285, following . The reasons for this decision are complex. With conflict in every province of the Empire, from Gaul to Syria, from Egypt to the lower Danube, Diocletian needed a lieutenant to manage his heavy workload. Historian Stephen Williams suggests that Diocletian considered himself a mediocre general and needed a man like Maximian to do most of his fighting.

The general consensus is that Maximian was appointed Caesar before being proclaimed Augustus (the official term for "emperor"), as stated by the contemporary writer Eusebius. However, some modern scholars have doubted this, as there is virtually no evidence for this. Even brief Caesars like Volusianus and Numerian, who only held the title for a few months, had coins minted in their names. Historian Richard Burgess argues that Maximian was never Caesar, and that his appointment as Augustus actually took place on 13 December 285, as opposed to the traditional date of 1 April 286, which has already been put into question by other authors.

Diocletian was vulnerable in that he had no sons, just a daughter, Valeria, who could never succeed him. He was forced therefore to seek a co-ruler from outside his family and that co-ruler had to be someone he trusted. The historian William Seston has argued that Diocletian, like heirless emperors before him, adopted Maximian as his filius Augusti ("Augustan son") upon his appointment to the office. Some agree, but the historian Frank Kolb has stated that arguments for the adoption are based on misreadings of the papyrological evidence. Maximian did take Diocletian's nomen (family name) Valerius, however.

Finally, Diocletian knew that single rule was dangerous and that precedent existed for dual rulership. Despite their military prowess, both sole-emperors Aurelian and Probus had been easily removed from power. In contrast, just a few years earlier, the emperor Carus and his sons had ruled jointly, albeit not for long. Even the first emperor, Augustus (r. 27 BC–AD 14), had shared power with his colleagues and more formal offices of co-emperor had existed from Marcus Aurelius (r. 161–180) on.

The dual system evidently worked well. Around 287, after Maximian's appointment as Augustus, the two rulers' relationship was re-defined in religious terms, with Diocletian assuming the title Iovius and Maximian Herculius. The titles were pregnant with symbolism: Diocletian-Jove had the dominant role of planning and commanding; Maximian-Hercules the heroic role of completing assigned tasks. Yet despite the symbolism, the emperors were not "gods" in the Imperial cult (although they may have been hailed as such in Imperial panegyrics). Instead, they were the gods' instruments, imposing the gods' will on earth. Once the rituals were over, Maximian assumed control of the government of the West and was dispatched to Gaul to fight the rebels known as Bagaudae while Diocletian returned to the East.

Early campaigns in Gaul and Germany

The Bagaudae of Gaul are obscure figures, appearing fleetingly in the ancient sources, with their 285 uprising being their first appearance. The fourth-century historian Eutropius described them as rural people under the leadership of Amandus and Aelianus, while Aurelius Victor called them bandits.Eutropius, Brev. 9.20; Aurelius Victor, de Caesaribus, 39.17, quoted in The historian David Potter suggests that they were more than peasants, seeking either Gallic political autonomy or reinstatement of the recently deposed Carus (a native of Gallia Narbonensis, in what would become southern France): in this case, they would be defecting imperial troops, not brigands. Although poorly equipped, led and trained – and therefore a poor match for Roman legions – Diocletian certainly considered the Bagaudae sufficient threat to merit an emperor to counter them. Maximian has been implicated in a massacre of Coptic Christian troops from the headquarters unit of a legion raised in Thebes at Aucanus in modern Switzerland in early 285, during the preparations for the campaign against the Bagaudae.

Maximian traveled to Gaul, engaging the Bagaudae late in mid-285. Details of the campaign are sparse and provide no tactical detail: the historical sources dwell only on Maximian's virtues and victories. The panegyric to Maximian in 289 records that the rebels were defeated with a blend of harshness and leniency. As the campaign was against the Empire's own citizens, and therefore distasteful, it went unrecorded in titles and official triumphs. Indeed, Maximian's panegyrist declares: "I pass quickly over this episode, for I see in your magnanimity you would rather forget this victory than celebrate it." By the end of the year, the revolt had significantly abated, and Maximian moved the bulk of his forces to the Rhine frontier, heralding a period of stability.Panegyrici Latini 10(2), quoted in ; .

Maximian did not put down the Bagaudae swiftly enough to avoid a Germanic reaction. In late 285, two barbarian armies – one of Burgundians and Alamanni, the other of Chaibones and Heruli – forded the Rhine and entered Gaul. The first army was left to die of disease and hunger, while Maximian intercepted and defeated the second. He then established a Rhine headquarters in preparation for future campaigns, either at Moguntiacum (Mainz, Germany), or at Augusta Treverorum (Trier, Germany),.

Carausius