The Roman History · Amm. 21.3.6

But now, being discovered, he desisted from his hostilities. For one of his secretaries, whom he had sent to Constantius, was taken prisoner by Julian's outposts, and when he was searched to see if he was the bearer of anything, a letter was found on him, which contained these words among others, "Your Cæsar is not submissive." But when he wrote to Julian he always addressed him as lord, and emperor, and god.

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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