For a great change was taking place in public affairs. When Hilary left Constantinople, early in the spring of the year 360, it was probably a profound secret in the capital that a rupture between Constantius and Julian was becoming inevitable. In affairs, civil and ecclesiastical, the Emperor and his favourite, the bishop Saturnine, must have seemed secure of their dominance in Gaul. But events moved rapidly. Constantius needed troops to strengthen the Eastern armies, never adequate to an emergency, for an impending war with Persia; he may also have desired to weaken the forces of Julian. He demanded men; those whom Julian detached for Eastern service refused to march, and proclaim Julian Emperor at Paris. This was in May, some months, at the least, before Hilary, delayed by his Italian labours in the cause of orthodoxy, can have reached home. Julian temporised; he kept up negotiations with Constantius, and employed his army in frontier warfare. But there could be no doubt of the issue. Conflict was inevitable, and the West could have little fear as to the result. The Western armies were the strongest in the Empire; it was with them that, in the last great trial of strength, Constantine the Great had won the day, and the victory of his nephew, successful and popular both as a commander and an administrator, must have been anticipated. Julian’s march against Constantius did not commence till the summer of the year 361; but long before this the rule of Constantius and the theological system for which he stood had been rejected by Gaul. The bishops had not shunned Saturninus, as Hilary had desired; most of them had been induced to give their sanction to Arianism at the Council of Rimini. While overshadowed by Constantius and his representative Saturninus, they had not dared to assert themselves. But now the moment was come, and with it the leader. Hilary’s arrival in Gaul must have taken place when the conflict was visibly impending, and he can have had no hesitation as to the side he should take. Julian’s rule in Gaul began but a few months before his exile, and they had probably never met face to face. But Julian had a well earned reputation as a righteous governor, and Hilary had introduced his name into his second appeal to Constantius, as a witness to his character and as suffering in fame by the injustice of Constantius. We must remember that Julian had kept his paganism carefully concealed, and that all the world, except a few intimate friends, took it for granted that he was, as the high standard of his life seemed to indicate, a sincere Christian. And now he had displaced Constantius in the supreme rule over Gaul, and Saturninus, who had by this time returned, was powerless. We cannot wonder that Hilary continued his efforts; that he went through the land, everywhere inducing the bishops to abjure their own confession made at Rimini. This the bishops, for their part, were certainly willing to do; they were no Arians at heart, and their treatment at Rimini, followed as it was by a fraudulent misrepresentation of the meaning of their words, must have aroused their just resentment. Under the rule of Julian there was no risk, there was even an advantage, in shewing their colours; it set them right both with the new Emperor and with public opinion. But it was not enough for Hilary’s purpose that the ‘inward evil’ of a wavering faith should be amended; it was also necessary that avowed heresy should be expelled. For this the co-operation of Julian was necessary; and before it was granted Julian might naturally look for some definite pronouncement on Hilary’s part. To this conjuncture, in the latter half of the year 360 or the earlier part of 361, we may best assign the publication of the Invective, already described, against Constantius. It was a renunciation of allegiance to his old master, not the less clear because the new is not mentioned. And with the name of Constantius was coupled that of Saturninus, as his abettor in tyranny and misbelief. Julian recognised the value of the Catholic alliance by giving effect to the decision of a Council held at Paris, which deposed Saturninus. Hilary had no ecclesiastical authority to gather such a Council, but his character and the eminence of his services no doubt rendered his colleagues willing to follow him; yet neither he nor they would have acted as they did without the assurance of Julian’s support. Their action committed them irrevocably to Julian’s cause; and it must have seemed that his expulsion of Saturninus committed him irrevocably to the orthodox side. Yet Julian impartially disbelieving both creeds, had made the ostensible cause of Saturninus’ exile not his errors of faith, but some of those charges of misconduct which were always forthcoming when a convenient excuse was wanted for the banishment of a bishop. Saturninus was a man of the world, and very possibly his Arianism was only assumed in aid of his ambition; it is likely enough that his conduct furnished sufficient grounds for his punishment. The fall of its chief, Sulpicius Severus says, destroyed the party. The other Arian prelates, who must have been few in number, submitted to the orthodox tests, with one exception. Paternus of Périgord, a man of no fame, had the courage of his convictions. He stubbornly asserted his belief, and shared the fate of Saturninus. Thus Hilary obtained, what he had failed to get in the case of the more prominent offender, a clear precedent for the deposition of bishops guilty of Arianism. The synodical letter, addressed to the Eastern bishops in reply to letters which some of them had sent to Hilary since his return, was incorporated by him in his History, to be mentioned hereafter Fragment xi.. The bishops of Gaul assert their orthodoxy, hold Auxentius, Valens, Ursacius and their like excommunicate, and have just excommunicated Saturninus. By his action at Paris, so Sulpicius says, Hilary earned the glory that it was by his single exertions that the provinces of Gaul were cleansed from the defilements of heresy Chron. ii. 45..