Eutropius

“ XIII About this time the Caesar Gallus, after committing many tyrannical acts, was put to death by Constantius. Gallus was a man naturally cruel, and too much inclined to tyranny, if he could but have reigned in his own right Silvanus also, who attempted an insurrection in Gaul, was cut off before the end of thirty days; and Constantius then remained sole ruler and emperor over the Roman dominions. ”

“ XV Not long after, when the German armies were withdrawing from the defence of Gaul, JULIAN was made emperor by the unanimous consent of the army, and, after the lapse of a year, went to take the government of Illyricum, while Constantius was engaged in the war with Parthia. Constantius, hearing what had occurred, and returning to the civil strife, died on his march between Cilicia and Cappadocia, in the thirty-eighth year of his reign, and the forty-fifth of his age, and was deservedly enrolled among the gods. ”

“ Vast forces of the Roman empire were cut off in that struggle, sufficient for any foreign wars, and for procuring many triumphs, and a lasting peace. Soon after, GALLUS, his uncle's son, was appointed by Constantius, as Caesar, over the east; and Magnentius, being defeated in several battles, put an end to his life at Lyons, in the third year and seventh month of his reign, as did also his brother at Sens, [10] whom he had sent as Caesar to defend Gaul. ”

“ But the plot being made known by Maximian's daughter Fausta, who communicated the design to her husband, Maximian was cut off at Marseilles, whence he was preparing to sail to join his son, and died a well-deserved death; for he was a man inclined to every kind of cruelty and severity, faithless, perverse, and utterly void of consideration for others.
IV At this time LICINIUS, a native of Dacia, was made emperor by Galerius, to whom he was known by old companionship, and recommended by his vigorous efforts and services in the war which he had conducted against Narseus. ”

“ XVII After him JOVIAN, who attended him in the expedition as one of his body-guard, was chosen by the suffrages of the soldiers to fill the throne; a man better known to the army by the fame of his father than by his own. ”

“ Division of the empire between Constantius and Galerius, Maximin and Severus being Caesars, I.----Constantine made emperor in Britain, and Maxentius, son of Maximian, at Rome; Maximian attempts to regain the throne; failure of Severus against Maxentius, II. ---- Subsequent efforts of Maximian; his death and character, III.----Four emperors at once, Constantine, Maxentius, Licinius, and Maximin, Maxentius overthrown by Constantine ”