Ammianus Marcellinus Res Gestae 21.6.2

[2] Among many others of conspicuous distinction there were also appointed to greet the emperor when he came from abroad some illustrious tribunes. Therefore when Constantius, on his return from Mesopotamia, was received with this attention, Amphilochius, a former tribune from Paphlagonia, who had served long before under Constans and was under well-founded suspicion of having sown the seeds of discord between the deceased brothers, ¹ having dared to appear somewhat arrogantly, as if he also ought to be admitted to this service, was recognised and forbidden. And when many raised an outcry and shouted that he ought not to be allowed longer to look upon the light of day, being a stiff-necked traitor, Constantius, milder than usual on this occasion, said: Cease to trouble a man who is, I believe, guilty, but has not yet been openly convicted; and remember that if he has committed anything of that kind, so long as he is in my sight he will be punished by the judgement of his own conscience, from which he will be unable to hide. And that was the end of it.