Res Gestae

While these events were taking place with the results already told, Agilo (as he was ordered) came to them, and covered by a close array of shields drew near confidently; but after giving a detailed and true account of the death of Constantius and the establishment of Julian’s rule, he was overwhelmed with endless abuse as a liar. And no one believed his account of what had happened until he

was admitted alone within the walls under a pledge of safe conduct and repeated what he had said, adding a solemn oath that it was true.