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After the elevation of Constantius I and Galerius to the rank of Augustus, two new Caesars were required to take their place. The two persons whom Galerius promoted to the rank of Caesar were very much his creatures, and he hoped to enhance his authority throughout the empire with their elevation.
First was Maximinus Daia, whose mother was Galerius' sister. An inexperienced youth with little formal education, he was invested with the purple, exalted to the dignity of Caesar, and assigned the command of Egypt and Syria. Second was Severus, Galerius' comrade in arms; he was sent to Milan to receive the possession of Italy and Africa. According to the forms of the constitution, Severus acknowledged the supremacy of the western emperor, but he was absolutely devoted to the commands of his benefactor Galerius, who, reserving to himself the intermediate countries from the confines of Italy to those of Syria, firmly established his power over three-quarters of the empire.
His hopes were dashed when his colleague Constantius died at York in 306 and the legions elevated his son Constantine to the position of Augustus. Galerius only discovered this when he received a letter from Constantine, who informed him of his father's death, modestly asserted his natural claim to the succession, and respectfully lamented that the enthusiastic violence of his troops had not allowed him to obtain the imperial purple in the regular and constitutional manner. The first emotions of Galerius were those of surprise, disappointment, and rage, and as he could seldom restrain his passions, he threatened to burn both the letter and the messenger.
Later, however, when he had time to reconsider his position, he inevitably saw that his chances of winning a war against Constantine were doubtful at best. Galerius was well aware of Constantine’s strengths – Constantine had been his guest for some time at Nicomedia – and knew that Constantius' legions were wildly devoted to his son. Therefore, without either condemning or ratifying the choice of the Roman army, Galerius accepted the son of his deceased colleague as the ruler of the provinces beyond the Alps; but he gave him only the title of Caesar, and the fourth rank among the Roman princes, whilst he conferred the vacant place of Augustus on his favourite Severus.
The ambitious spirit of Galerius was only just over this disappointment when he beheld the unexpected loss of Italy to Maxentius, who was married to his daughter Valeria Maximilla. Galerius’ need for additional revenue had persuaded him to make a very strict and rigorous examination of the property of his subjects for the purpose of a general taxation. A very minute survey was taken of their real estates and, wherever there was the slightest suspicion of concealment, torture was used to obtain a sincere declaration of their personal wealth. Italy had traditionally been exempt from any form of taxation, but Galerius ignored this precedent, and the officers of the revenue already began to number the Roman people, and to settle the proportion of the new taxes. Italy began to murmur against this indignity and Maxentius used this sentiment to declare himself emperor in Italy, to the fury of Galerius. Therefore, Galerius ordered his colleague Severus to immediately march to Rome, in the full confidence that, by his unexpected arrival, he would easily suppress the rebellion. Severus was captured after his troops deserted to their old commander Maximian, who had once again been elevated to the rank of co-emperor, this time by his son Maxentius. Severus was later executed.
The importance of the occasion needed the presence and abilities of Galerius. At the head of a powerful army collected from Illyricum and the East, he entered Italy, determined to avenge Severus and to punish the rebellious Romans.[citation needed] But due to the skill of Maximian, Galerius found every place hostile, fortified, and inaccessible; and though he forced his way as far as Narni, within sixty miles of Rome, his control in Italy was confined to the narrow limits of his camp.
Seeing that he was facing ever-greater difficulties, Galerius made the first advances towards reconciliation, and dispatched two officers to tempt the Romans by the offer of a conference, and the declaration of his paternal regard for Maxentius, reminding them that they would obtain much more from his willing generosity than anything that might have been obtained through a military campaign. The offers of Galerius were rejected with firmness, his friendship refused, and it was not long before he discovered that, unless he retreated, he would share Severus' fate. It was not a moment too soon; large monetary gifts from Maxentius to his soldiers had corrupted the fidelity of the Illyrian legions. When Galerius finally began his withdrawal from Italy, it was only with great difficulty that he managed to stop his veterans deserting him.[26]
In frustration, Galerius allowed his legions to ravage the countryside as they passed northwards. Maxentius declined to make a general engagement.
With so many emperors now in existence, in 308 Galerius, together with the retired emperor Diocletian and the now active Maximian, called an imperial 'conference' at Carnuntum on the River Danube to rectify the situation and bring some order back into the imperial government.[citation needed] Here it was agreed that Galerius’ long-time friend and military companion Licinius, who had been entrusted by Galerius with the defense of the Danube while Galerius was in Italy, would become Augustus in the West, with Constantine as his Caesar. In the East, Galerius remained Augustus and Maximinus remained his Caesar. Maximian was to retire, and Maxentius was declared a usurper.
Galerius’ plan soon failed. The news of Licinius’ promotion was no sooner carried into the East, than Maximinus, who governed the provinces of Egypt and Syria, rejected his position as Caesar, and, notwithstanding the prayers as well as arguments of Galerius, exacted the equal title of Augustus.[26] For the first, and indeed for the last time, six emperors administered the Roman world. Though the opposition of interest, and the memory of a recent war, divided the empire into two great hostile powers, their mutual fears and the fading authority of Galerius produced an apparent tranquility in the imperial government.
The last years of Galerius saw him relinquishing his aspirations towards being the supreme ruler of the empire, though he managed to retain the position of first among equals. He spent the remainder of his years enjoying himself and ordering some important public works, such as discharging into the Danube the superfluous waters of Lake Pelso, and cutting down the immense forests that encompassed it.