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. 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.
These events happened before Julian left the country, in the middle of the summer of 361, on his march against Constantius; or at least, if the actual proceedings were subsequent to his departure, they must have quickly followed it, for his sanction was necessary, and when that was obtained there was no motive for delay. And now, for some years, Hilary disappears from sight. He tells us nothing in his writings of the ordinary course of his life and work; even his informal and discursive Homilies cast no light upon his methods of administration, his successes or failures, and very little on the character of his flock. There was no further conflict within the Church of Gaul during Hilary’s lifetime. The death of Constantius, which happened before Julian could meet him in battle, removed all political anxiety. Julian himself was too busy with the revival of paganism in the East to concern himself seriously with its promotion in the Latin-speaking provinces, from which he was absent, and for which he cared less. The orthodox cause in Gaul did not suffer by his apostasy. His short reign was followed by the still briefer rule of the Catholic Jovian. Next came Valentinian, personally orthodox, but steadily refusing to allow depositions on account of doctrine. Under him Arianism dwindled away; Catholic successors were elected to Arian prelates, and the process would have been hastened but by a few years had Hilary been permitted to expel Auxentius from Milan, as we shall presently see him attempting to do.