The Roman History · Amm. 22.1.2

Aprunculus Gallus, an orator and a man of skill as a soothsayer, who was afterwards promoted to be governor of Narbonne, announced these results to him, being taught beforehand by the inspection of a liver, as he affirmed, which he had seen covered with a double skin. And while Julian was fearing that he was inventing stories to correspond with his desires, and was on that account out of humour, he himself beheld a far more favourable omen, which clearly predicted the death of Constantius. For at the same moment that that prince died in Cilicia, the soldier who, as he was going to mount his horse, had supported him with his right hand, fell down, on which Julian at once exclaimed, in the hearing of many persons, that he who had raised him to the summit had fallen.

Ammianus Marcellinus · translated by C. D. Yonge · 1911 reprint
C. D. Yonge translation (preface dated February 1862); G. Bell and Sons, 1911; Project Gutenberg #28587
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