Chapter 1
Constantius was much enraged when he heard what had happened to Montius and Domitian, and summoned to his presence Gallus, who immediately obeyed the command, because, although he suspected no good from his sudden summons, yet he feared the chance of a civil war following in the event of his refusal. Constantia, however, went on before him, and endeavoured to obtain an interview with her brother before her husband, and to implore mercy on his behalf. But upon her arrival at Bithynia, her journey and her life were at once broken off by a sudden attack which ended fatally. By this mischance the fears of Gallus were considerably increased, but still he did not depart from his previous resolution, so he went on his way accompanied by Theophilus the Indian. Moreover, upon the arrival of Gallus in Noricum, Barbation is sent from Milan, where Constantius then happened to be, to strip him of his purple robes, and to banish him to an island in Dalmatia. But Theophilus, who chanced to be at hand, would by no means allow the matter to be brought to so ready a decision: for at the time when Gallus was created Caesar, he was himself the mediator of the treaty made between Gallus and Constantius, by which they mutually pledged themselves to friendship, and promised that they would not lay plots against each other; and it was he who all along had kept them at peace. Accordingly, on being informed of this middle position thus held by Theophilus, Constantius ordered him to be sent away into exile, and Gallus to be stripped of his purple and carried in the dress of a private citizen into a certain island, where a military guard was set over him. Moreover, the eunuch Eusebius, who had been elevated to the dignity of a Praepositus, was supported by a party in his attempts to excite the mind of Constantius more and more against Gallus; for they feared that Constantius, either in remembrance of his oath, or moved by the tie of consanguinity, would recall the Caesar from banishment, and that Gallus, as soon as he had escaped that danger, would miserably destroy them all. Accordingly, they fraudulently and treacherously plotted together and sent persons to put Gallus to death. But, before the deed of blood was accomplished, Constantine relented, and sent another party to prevent the bloodshed. But Eusebius persuaded them not to approach the island, and not to show any one the rescript of the emperor forbidding the execution of Gallus before he was actually put to the sword. The matter was carried out in accordance with their designs: and hence it was that Julian, when he afterwards succeeded to the purple, put to death Eusebius and his comrades on account of the iniquitous execution of Gallus.
Chapter 2
Constantius, moreover, weighing well the weight of the imperial power, and his own inability to support it single-handed, summoned Julian, the brother of Gallus, out of Ionia, and appointed him Caesar, at the same time giving him his sister Helen in marriage; and sent him forthwith into Gaul as governor; for matters were in a very troubled state in those parts.
Chapter 3
He went however himself to Sirmium, where he settled for some time. At this period he recalled from exile and restored to his citizens Liberius the bishop of Rome, for whose recall the Romans were very clamorous. Philostorgius then goes on to say that this same Liberius, and with him Hosius the bishop [of Cordova], wrote openly against the term "consubstantial," and against Athanasius himself, when a synod had been convened there, and had brought over the aforementioned prelates to its own opinion. But as soon as they had subscribed, adds Philostorgius, Hosius returned to his see of Cordova in Spain and governed the church in that place, while Liberius administered the church of Rome. Felix, who had been consecrated as bishop during the absence of Liberius, voluntarily retired, retaining the dignity of a bishop, though he presided over no local church.