Res Gestae
Ammianus Marcellinus
Ammianus Marcellinus. Ammianus Marcellinus, with an English translation, Vols. I-III. Rolfe, John C., translator. Cambridge, MA; London: Harvard University Press; W. Heinemann, 1935-1940 (printing).
And in order to treat with greater honour those who were going far away, he invited their officers to dinner and bade them make any request that was in their minds. And since they were so liberally entertained, they departed anxious and filled with twofold
But no sooner had night come on than they broke out in open revolt, and, with their minds excited to the extent that each was distressed by the unexpected occurrence, they turned to arms and action; with mighty tumult they all made for the palace,[*](Later destroyed by the Normans. It was perhaps the building known under the name of Domus Thermarum, and Palatium Thermarum. ) and wholly surrounding it, so that no one could possibly get out, with terrifying outcries they hailed Julian as Augustus, urgently demanding that he should show himself to them. They were compelled to wait for the appearance of daylight, but finally forced him to come out; and as soon as they saw him, they redoubled their shouts and with determined unanimity hailed him as Augustus.